diff --git a/Lib/fontTools/__init__.py b/Lib/fontTools/__init__.py
index 92f1e2cb9..79759acf1 100644
--- a/Lib/fontTools/__init__.py
+++ b/Lib/fontTools/__init__.py
@@ -4,6 +4,6 @@ from fontTools.misc.loggingTools import configLogger
 
 log = logging.getLogger(__name__)
 
-version = __version__ = "4.1.1.dev0"
+version = __version__ = "4.2.1.dev0"
 
 __all__ = ["version", "log", "configLogger"]
diff --git a/Lib/fontTools/pens/filterPen.py b/Lib/fontTools/pens/filterPen.py
index 0ebb9c23b..7539efb5c 100644
--- a/Lib/fontTools/pens/filterPen.py
+++ b/Lib/fontTools/pens/filterPen.py
@@ -1,12 +1,13 @@
 from fontTools.misc.py23 import *
 from fontTools.pens.basePen import AbstractPen
+from fontTools.pens.pointPen import AbstractPointPen
 from fontTools.pens.recordingPen import RecordingPen
 
 
 class _PassThruComponentsMixin(object):
 
-    def addComponent(self, glyphName, transformation):
-        self._outPen.addComponent(glyphName, transformation)
+    def addComponent(self, glyphName, transformation, **kwargs):
+        self._outPen.addComponent(glyphName, transformation, **kwargs)
 
 
 class FilterPen(_PassThruComponentsMixin, AbstractPen):
@@ -118,3 +119,41 @@ class ContourFilterPen(_PassThruComponentsMixin, RecordingPen):
         Otherwise, the return value is drawn with the output pen.
         """
         return  # or return contour
+
+
+class FilterPointPen(_PassThruComponentsMixin, AbstractPointPen):
+    """ Baseclass for point pens that apply some transformation to the
+    coordinates they receive and pass them to another point pen.
+
+    You can override any of its methods. The default implementation does
+    nothing, but passes the commands unmodified to the other pen.
+
+    >>> from fontTools.pens.recordingPen import RecordingPointPen
+    >>> rec = RecordingPointPen()
+    >>> pen = FilterPointPen(rec)
+    >>> v = iter(rec.value)
+    >>> pen.beginPath(identifier="abc")
+    >>> next(v)
+    ('beginPath', (), {'identifier': 'abc'})
+    >>> pen.addPoint((1, 2), "line", False)
+    >>> next(v)
+    ('addPoint', ((1, 2), 'line', False, None), {})
+    >>> pen.addComponent("a", (2, 0, 0, 2, 10, -10), identifier="0001")
+    >>> next(v)
+    ('addComponent', ('a', (2, 0, 0, 2, 10, -10)), {'identifier': '0001'})
+    >>> pen.endPath()
+    >>> next(v)
+    ('endPath', (), {})
+    """
+
+    def __init__(self, outPointPen):
+        self._outPen = outPointPen
+
+    def beginPath(self, **kwargs):
+        self._outPen.beginPath(**kwargs)
+
+    def endPath(self):
+        self._outPen.endPath()
+
+    def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
+        self._outPen.addPoint(pt, segmentType, smooth, name, **kwargs)
diff --git a/Lib/fontTools/pens/recordingPen.py b/Lib/fontTools/pens/recordingPen.py
index dbbcc916c..b25011d6d 100644
--- a/Lib/fontTools/pens/recordingPen.py
+++ b/Lib/fontTools/pens/recordingPen.py
@@ -1,9 +1,15 @@
 """Pen recording operations that can be accessed or replayed."""
 from fontTools.misc.py23 import *
 from fontTools.pens.basePen import AbstractPen, DecomposingPen
+from fontTools.pens.pointPen import AbstractPointPen
 
 
-__all__ = ["replayRecording", "RecordingPen", "DecomposingRecordingPen"]
+__all__ = [
+	"replayRecording",
+	"RecordingPen",
+	"DecomposingRecordingPen",
+	"RecordingPointPen",
+]
 
 
 def replayRecording(recording, pen):
@@ -89,6 +95,51 @@ class DecomposingRecordingPen(DecomposingPen, RecordingPen):
 	skipMissingComponents = False
 
 
+class RecordingPointPen(AbstractPointPen):
+	"""PointPen recording operations that can be accessed or replayed.
+
+	The recording can be accessed as pen.value; or replayed using
+	pointPen.replay(otherPointPen).
+
+	Usage example:
+	==============
+	from defcon import Font
+	from fontTools.pens.recordingPen import RecordingPointPen
+
+	glyph_name = 'a'
+	font_path = 'MyFont.ufo'
+
+	font = Font(font_path)
+	glyph = font[glyph_name]
+
+	pen = RecordingPointPen()
+	glyph.drawPoints(pen)
+	print(pen.value)
+
+	new_glyph = font.newGlyph('b')
+	pen.replay(new_glyph.getPointPen())
+	"""
+
+	def __init__(self):
+		self.value = []
+
+	def beginPath(self, **kwargs):
+		self.value.append(("beginPath", (), kwargs))
+
+	def endPath(self):
+		self.value.append(("endPath", (), {}))
+
+	def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
+		self.value.append(("addPoint", (pt, segmentType, smooth, name), kwargs))
+
+	def addComponent(self, baseGlyphName, transformation, **kwargs):
+		self.value.append(("addComponent", (baseGlyphName, transformation), kwargs))
+
+	def replay(self, pointPen):
+		for operator, args, kwargs in self.value:
+			getattr(pointPen, operator)(*args, **kwargs)
+
+
 if __name__ == "__main__":
 	from fontTools.pens.basePen import _TestPen
 	pen = RecordingPen()
diff --git a/Lib/fontTools/pens/roundingPen.py b/Lib/fontTools/pens/roundingPen.py
new file mode 100644
index 000000000..c032cad1f
--- /dev/null
+++ b/Lib/fontTools/pens/roundingPen.py
@@ -0,0 +1,112 @@
+from fontTools.misc.fixedTools import otRound
+from fontTools.misc.transform import Transform
+from fontTools.pens.filterPen import FilterPen, FilterPointPen
+
+
+__all__ = ["RoundingPen", "RoundingPointPen"]
+
+
+class RoundingPen(FilterPen):
+    """
+    Filter pen that rounds point coordinates and component XY offsets to integer.
+
+    >>> from fontTools.pens.recordingPen import RecordingPen
+    >>> recpen = RecordingPen()
+    >>> roundpen = RoundingPen(recpen)
+    >>> roundpen.moveTo((0.4, 0.6))
+    >>> roundpen.lineTo((1.6, 2.5))
+    >>> roundpen.qCurveTo((2.4, 4.6), (3.3, 5.7), (4.9, 6.1))
+    >>> roundpen.curveTo((6.4, 8.6), (7.3, 9.7), (8.9, 10.1))
+    >>> roundpen.addComponent("a", (1.5, 0, 0, 1.5, 10.5, -10.5))
+    >>> recpen.value == [
+    ...     ('moveTo', ((0, 1),)),
+    ...     ('lineTo', ((2, 3),)),
+    ...     ('qCurveTo', ((2, 5), (3, 6), (5, 6))),
+    ...     ('curveTo', ((6, 9), (7, 10), (9, 10))),
+    ...     ('addComponent', ('a', (1.5, 0, 0, 1.5, 11, -10))),
+    ... ]
+    True
+    """
+
+    def __init__(self, outPen, roundFunc=otRound):
+        super().__init__(outPen)
+        self.roundFunc = roundFunc
+
+    def moveTo(self, pt):
+        self._outPen.moveTo((self.roundFunc(pt[0]), self.roundFunc(pt[1])))
+
+    def lineTo(self, pt):
+        self._outPen.lineTo((self.roundFunc(pt[0]), self.roundFunc(pt[1])))
+
+    def curveTo(self, *points):
+        self._outPen.curveTo(
+            *((self.roundFunc(x), self.roundFunc(y)) for x, y in points)
+        )
+
+    def qCurveTo(self, *points):
+        self._outPen.qCurveTo(
+            *((self.roundFunc(x), self.roundFunc(y)) for x, y in points)
+        )
+
+    def addComponent(self, glyphName, transformation):
+        self._outPen.addComponent(
+            glyphName,
+            Transform(
+                *transformation[:4],
+                self.roundFunc(transformation[4]),
+                self.roundFunc(transformation[5]),
+            ),
+        )
+
+
+class RoundingPointPen(FilterPointPen):
+    """
+    Filter point pen that rounds point coordinates and component XY offsets to integer.
+
+    >>> from fontTools.pens.recordingPen import RecordingPointPen
+    >>> recpen = RecordingPointPen()
+    >>> roundpen = RoundingPointPen(recpen)
+    >>> roundpen.beginPath()
+    >>> roundpen.addPoint((0.4, 0.6), 'line')
+    >>> roundpen.addPoint((1.6, 2.5), 'line')
+    >>> roundpen.addPoint((2.4, 4.6))
+    >>> roundpen.addPoint((3.3, 5.7))
+    >>> roundpen.addPoint((4.9, 6.1), 'qcurve')
+    >>> roundpen.endPath()
+    >>> roundpen.addComponent("a", (1.5, 0, 0, 1.5, 10.5, -10.5))
+    >>> recpen.value == [
+    ...     ('beginPath', (), {}),
+    ...     ('addPoint', ((0, 1), 'line', False, None), {}),
+    ...     ('addPoint', ((2, 3), 'line', False, None), {}),
+    ...     ('addPoint', ((2, 5), None, False, None), {}),
+    ...     ('addPoint', ((3, 6), None, False, None), {}),
+    ...     ('addPoint', ((5, 6), 'qcurve', False, None), {}),
+    ...     ('endPath', (), {}),
+    ...     ('addComponent', ('a', (1.5, 0, 0, 1.5, 11, -10)), {}),
+    ... ]
+    True
+    """
+
+    def __init__(self, outPen, roundFunc=otRound):
+        super().__init__(outPen)
+        self.roundFunc = roundFunc
+
+    def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
+        self._outPen.addPoint(
+            (self.roundFunc(pt[0]), self.roundFunc(pt[1])),
+            segmentType=segmentType,
+            smooth=smooth,
+            name=name,
+            **kwargs,
+        )
+
+    def addComponent(self, baseGlyphName, transformation, **kwargs):
+        self._outPen.addComponent(
+            baseGlyphName,
+            Transform(
+                *transformation[:4],
+                self.roundFunc(transformation[4]),
+                self.roundFunc(transformation[5]),
+            ),
+            **kwargs,
+        )
diff --git a/Lib/fontTools/pens/transformPen.py b/Lib/fontTools/pens/transformPen.py
index 8d33a0865..6619ba739 100644
--- a/Lib/fontTools/pens/transformPen.py
+++ b/Lib/fontTools/pens/transformPen.py
@@ -1,5 +1,5 @@
 from fontTools.misc.py23 import *
-from fontTools.pens.filterPen import FilterPen
+from fontTools.pens.filterPen import FilterPen, FilterPointPen
 
 
 __all__ = ["TransformPen"]
@@ -55,6 +55,51 @@ class TransformPen(FilterPen):
 		self._outPen.addComponent(glyphName, transformation)
 
 
+class TransformPointPen(FilterPointPen):
+	"""PointPen that transforms all coordinates using a Affine transformation,
+	and passes them to another PointPen.
+
+	>>> from fontTools.pens.recordingPen import RecordingPointPen
+	>>> rec = RecordingPointPen()
+	>>> pen = TransformPointPen(rec, (2, 0, 0, 2, -10, 5))
+	>>> v = iter(rec.value)
+	>>> pen.beginPath(identifier="contour-0")
+	>>> next(v)
+	('beginPath', (), {'identifier': 'contour-0'})
+	>>> pen.addPoint((100, 100), "line")
+	>>> next(v)
+	('addPoint', ((190, 205), 'line', False, None), {})
+	>>> pen.endPath()
+	>>> next(v)
+	('endPath', (), {})
+	>>> pen.addComponent("a", (1, 0, 0, 1, -10, 5), identifier="component-0")
+	>>> next(v)
+	('addComponent', ('a', <Transform [2 0 0 2 -30 15]>), {'identifier': 'component-0'})
+	"""
+
+	def __init__(self, outPointPen, transformation):
+		"""The 'outPointPen' argument is another point pen object.
+		It will receive the transformed coordinates.
+		The 'transformation' argument can either be a six-tuple, or a
+		fontTools.misc.transform.Transform object.
+		"""
+		super().__init__(outPointPen)
+		if not hasattr(transformation, "transformPoint"):
+			from fontTools.misc.transform import Transform
+			transformation = Transform(*transformation)
+		self._transformation = transformation
+		self._transformPoint = transformation.transformPoint
+
+	def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
+		self._outPen.addPoint(
+			self._transformPoint(pt), segmentType, smooth, name, **kwargs
+		)
+
+	def addComponent(self, baseGlyphName, transformation, **kwargs):
+		transformation = self._transformation.transform(transformation)
+		self._outPen.addComponent(baseGlyphName, transformation, **kwargs)
+
+
 if __name__ == "__main__":
 	from fontTools.pens.basePen import _TestPen
 	pen = TransformPen(_TestPen(None), (2, 0, 0.5, 2, -10, 0))
diff --git a/Lib/fontTools/pens/ttGlyphPen.py b/Lib/fontTools/pens/ttGlyphPen.py
index 3996e3cd8..f7b1483b2 100644
--- a/Lib/fontTools/pens/ttGlyphPen.py
+++ b/Lib/fontTools/pens/ttGlyphPen.py
@@ -1,6 +1,6 @@
 from fontTools.misc.py23 import *
 from array import array
-from fontTools.misc.fixedTools import MAX_F2DOT14
+from fontTools.misc.fixedTools import MAX_F2DOT14, otRound
 from fontTools.pens.basePen import LoggingPen
 from fontTools.pens.transformPen import TransformPen
 from fontTools.ttLib.tables import ttProgram
@@ -118,7 +118,7 @@ class TTGlyphPen(LoggingPen):
 
             component = GlyphComponent()
             component.glyphName = glyphName
-            component.x, component.y = transformation[4:]
+            component.x, component.y = (otRound(v) for v in transformation[4:])
             transformation = transformation[:4]
             if transformation != (1, 0, 0, 1):
                 if (self.handleOverflowingTransforms and
@@ -138,6 +138,7 @@ class TTGlyphPen(LoggingPen):
 
         glyph = Glyph()
         glyph.coordinates = GlyphCoordinates(self.points)
+        glyph.coordinates.toInt()
         glyph.endPtsOfContours = self.endPts
         glyph.flags = array("B", self.types)
         self.init()
diff --git a/Lib/fontTools/ufoLib/__init__.py b/Lib/fontTools/ufoLib/__init__.py
index 8e22242e7..fb09bf6e5 100755
--- a/Lib/fontTools/ufoLib/__init__.py
+++ b/Lib/fontTools/ufoLib/__init__.py
@@ -339,7 +339,8 @@ class UFOReader(_UFOBaseIO):
 			# convert kerning and groups
 			kerning, groups, conversionMaps = convertUFO1OrUFO2KerningToUFO3Kerning(
 				self._upConvertedKerningData["originalKerning"],
-				deepcopy(self._upConvertedKerningData["originalGroups"])
+				deepcopy(self._upConvertedKerningData["originalGroups"]),
+				self.getGlyphSet()
 			)
 			# store
 			self._upConvertedKerningData["kerning"] = kerning
@@ -637,7 +638,7 @@ class UFOReader(_UFOBaseIO):
 
 		``validateRead`` will validate the read data, by default it is set to the
 		class's validate value, can be overridden.
-		``validateWrte`` will validate the written data, by default it is set to the
+		``validateWrite`` will validate the written data, by default it is set to the
 		class's validate value, can be overridden.
 		"""
 		from fontTools.ufoLib.glifLib import GlyphSet
diff --git a/Lib/fontTools/ufoLib/converters.py b/Lib/fontTools/ufoLib/converters.py
index 0e2dae1a0..3b8112c35 100644
--- a/Lib/fontTools/ufoLib/converters.py
+++ b/Lib/fontTools/ufoLib/converters.py
@@ -6,16 +6,16 @@ Conversion functions.
 
 # adapted from the UFO spec
 
-def convertUFO1OrUFO2KerningToUFO3Kerning(kerning, groups):
+def convertUFO1OrUFO2KerningToUFO3Kerning(kerning, groups, glyphSet=()):
     # gather known kerning groups based on the prefixes
     firstReferencedGroups, secondReferencedGroups = findKnownKerningGroups(groups)
     # Make lists of groups referenced in kerning pairs.
     for first, seconds in list(kerning.items()):
-        if first in groups:
+        if first in groups and first not in glyphSet:
             if not first.startswith("public.kern1."):
                 firstReferencedGroups.add(first)
         for second in list(seconds.keys()):
-            if second in groups:
+            if second in groups and second not in glyphSet:
                 if not second.startswith("public.kern2."):
                     secondReferencedGroups.add(second)
     # Create new names for these groups.
@@ -154,7 +154,7 @@ def test():
     ...     "DGroup" : ["D"],
     ... }
     >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
-    ...     testKerning, testGroups)
+    ...     testKerning, testGroups, [])
     >>> expected = {
     ...     "A" : {
     ...         "A": 1,
@@ -220,7 +220,7 @@ def test():
     ...     "@MMK_R_XGroup" : ["X"],
     ... }
     >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
-    ...     testKerning, testGroups)
+    ...     testKerning, testGroups, [])
     >>> expected = {
     ...     "A" : {
     ...         "A": 1,
@@ -293,7 +293,7 @@ def test():
     ...     "DGroup" : ["D"],
     ... }
     >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
-    ...     testKerning, testGroups)
+    ...     testKerning, testGroups, [])
     >>> expected = {
     ...     "A" : {
     ...         "A": 1,
diff --git a/Lib/fontTools/ufoLib/validators.py b/Lib/fontTools/ufoLib/validators.py
index 3f35d35a2..49cb0e49d 100644
--- a/Lib/fontTools/ufoLib/validators.py
+++ b/Lib/fontTools/ufoLib/validators.py
@@ -883,7 +883,7 @@ def groupsValidator(value):
 			return False, "A group has an empty name."
 		if groupName.startswith("public."):
 			if not groupName.startswith("public.kern1.") and not groupName.startswith("public.kern2."):
-				# unknown pubic.* name. silently skip.
+				# unknown public.* name. silently skip.
 				continue
 			else:
 				if len("public.kernN.") == len(groupName):
diff --git a/Lib/fontTools/varLib/__init__.py b/Lib/fontTools/varLib/__init__.py
index 80bd09b4b..66dfa3572 100644
--- a/Lib/fontTools/varLib/__init__.py
+++ b/Lib/fontTools/varLib/__init__.py
@@ -795,7 +795,7 @@ def set_default_weight_width_slant(font, location):
 		if "wght" in location:
 			weight_class = otRound(max(1, min(location["wght"], 1000)))
 			if font["OS/2"].usWeightClass != weight_class:
-				log.info("Setting OS/2.usWidthClass = %s", weight_class)
+				log.info("Setting OS/2.usWeightClass = %s", weight_class)
 				font["OS/2"].usWeightClass = weight_class
 
 		if "wdth" in location:
diff --git a/NEWS.rst b/NEWS.rst
index 56e3d58e3..37834877b 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -1,3 +1,21 @@
+4.2.0 (released 2019-11-28)
+---------------------------
+
+- [pens] Added the following pens:
+
+  * ``roundingPen.RoundingPen``: filter pen that rounds coordinates and components'
+    offsets to integer;
+  * ``roundingPen.RoundingPointPen``: like the above, but using PointPen protocol.
+  * ``filterPen.FilterPointPen``: base class for filter point pens;
+  * ``transformPen.TransformPointPen``: filter point pen to apply affine transform;
+  * ``recordingPen.RecordingPointPen``: records and replays point-pen commands.
+
+- [ttGlyphPen] Always round float coordinates and component offsets to integers
+  (#1763).
+- [ufoLib] When converting kerning groups from UFO2 to UFO3, avoid confusing
+  groups with the same name as one of the glyphs (#1761, #1762,
+  unified-font-object/ufo-spec#98).
+
 4.1.0 (released 2019-11-18)
 ---------------------------
 
diff --git a/Tests/pens/recordingPen_test.py b/Tests/pens/recordingPen_test.py
index 971536d7a..6977b93b0 100644
--- a/Tests/pens/recordingPen_test.py
+++ b/Tests/pens/recordingPen_test.py
@@ -1,19 +1,29 @@
-from fontTools.misc.py23 import *
-from fontTools.pens.recordingPen import RecordingPen, DecomposingRecordingPen
+from fontTools.pens.recordingPen import (
+    RecordingPen,
+    DecomposingRecordingPen,
+    RecordingPointPen,
+)
 import pytest
 
 
 class _TestGlyph(object):
-
     def draw(self, pen):
         pen.moveTo((0.0, 0.0))
         pen.lineTo((0.0, 100.0))
         pen.curveTo((50.0, 75.0), (60.0, 50.0), (50.0, 0.0))
         pen.closePath()
 
+    def drawPoints(self, pen):
+        pen.beginPath(identifier="abc")
+        pen.addPoint((0.0, 0.0), "line", False, "start", identifier="0000")
+        pen.addPoint((0.0, 100.0), "line", False, None, identifier="0001")
+        pen.addPoint((50.0, 75.0), None, False, None, identifier="0002")
+        pen.addPoint((60.0, 50.0), None, False, None, identifier="0003")
+        pen.addPoint((50.0, 0.0), "curve", True, "last", identifier="0004")
+        pen.endPath()
+
 
 class RecordingPenTest(object):
-
     def test_addComponent(self):
         pen = RecordingPen()
         pen.addComponent("a", (2, 0, 0, 3, -10, 5))
@@ -21,18 +31,42 @@ class RecordingPenTest(object):
 
 
 class DecomposingRecordingPenTest(object):
-
     def test_addComponent_decomposed(self):
         pen = DecomposingRecordingPen({"a": _TestGlyph()})
         pen.addComponent("a", (2, 0, 0, 3, -10, 5))
         assert pen.value == [
-            ('moveTo', ((-10.0, 5.0),)),
-            ('lineTo', ((-10.0, 305.0),)),
-            ('curveTo', ((90.0, 230.0), (110.0, 155.0), (90.0, 5.0),)),
-            ('closePath', ())]
+            ("moveTo", ((-10.0, 5.0),)),
+            ("lineTo", ((-10.0, 305.0),)),
+            ("curveTo", ((90.0, 230.0), (110.0, 155.0), (90.0, 5.0))),
+            ("closePath", ()),
+        ]
 
     def test_addComponent_missing_raises(self):
         pen = DecomposingRecordingPen(dict())
         with pytest.raises(KeyError) as excinfo:
             pen.addComponent("a", (1, 0, 0, 1, 0, 0))
         assert excinfo.value.args[0] == "a"
+
+
+class RecordingPointPenTest:
+    def test_record_and_replay(self):
+        pen = RecordingPointPen()
+        glyph = _TestGlyph()
+        glyph.drawPoints(pen)
+        pen.addComponent("a", (2, 0, 0, 2, -10, 5))
+
+        assert pen.value == [
+            ("beginPath", (), {"identifier": "abc"}),
+            ("addPoint", ((0.0, 0.0), "line", False, "start"), {"identifier": "0000"}),
+            ("addPoint", ((0.0, 100.0), "line", False, None), {"identifier": "0001"}),
+            ("addPoint", ((50.0, 75.0), None, False, None), {"identifier": "0002"}),
+            ("addPoint", ((60.0, 50.0), None, False, None), {"identifier": "0003"}),
+            ("addPoint", ((50.0, 0.0), "curve", True, "last"), {"identifier": "0004"}),
+            ("endPath", (), {}),
+            ("addComponent", ("a", (2, 0, 0, 2, -10, 5)), {}),
+        ]
+
+        pen2 = RecordingPointPen()
+        pen.replay(pen2)
+
+        assert pen2.value == pen.value
diff --git a/Tests/pens/ttGlyphPen_test.py b/Tests/pens/ttGlyphPen_test.py
index ec9458903..961738d47 100644
--- a/Tests/pens/ttGlyphPen_test.py
+++ b/Tests/pens/ttGlyphPen_test.py
@@ -239,6 +239,31 @@ class TTGlyphPenTest(TestCase):
         with self.assertRaises(struct.error):
             compositeGlyph.compile({'a': baseGlyph})
 
+    def assertGlyphBoundsEqual(self, glyph, bounds):
+        self.assertEqual((glyph.xMin, glyph.yMin, glyph.xMax, glyph.yMax), bounds)
+
+    def test_round_float_coordinates_and_component_offsets(self):
+        glyphSet = {}
+        pen = TTGlyphPen(glyphSet)
+
+        pen.moveTo((0, 0))
+        pen.lineTo((0, 1))
+        pen.lineTo((367.6, 0))
+        pen.closePath()
+        simpleGlyph = pen.glyph()
+
+        simpleGlyph.recalcBounds(glyphSet)
+        self.assertGlyphBoundsEqual(simpleGlyph, (0, 0, 368, 1))
+
+        componentName = 'a'
+        glyphSet[componentName] = simpleGlyph
+
+        pen.addComponent(componentName, (1, 0, 0, 1, -86.4, 0))
+        compositeGlyph = pen.glyph()
+
+        compositeGlyph.recalcBounds(glyphSet)
+        self.assertGlyphBoundsEqual(compositeGlyph, (-86, 0, 282, 1))
+
 
 class _TestGlyph(object):
     def __init__(self, glyph):
diff --git a/Tests/ufoLib/UFOConversion_test.py b/Tests/ufoLib/UFOConversion_test.py
index c19bc0ce1..98a08121c 100644
--- a/Tests/ufoLib/UFOConversion_test.py
+++ b/Tests/ufoLib/UFOConversion_test.py
@@ -137,7 +137,9 @@ class KerningUpConversionTestCase(unittest.TestCase):
 		("A", "public.kern2.CGroup"): 3,
 		("A", "public.kern2.DGroup"): 4,
 		("A", "A"): 1,
-		("A", "B"): 2
+		("A", "B"): 2,
+		("X", "A"): 13,
+		("X", "public.kern2.CGroup"): 14
 	}
 
 	expectedGroups = {
@@ -148,7 +150,8 @@ class KerningUpConversionTestCase(unittest.TestCase):
 		"public.kern1.CGroup": ["C", "Ccedilla"],
 		"public.kern2.CGroup": ["C", "Ccedilla"],
 		"public.kern2.DGroup": ["D"],
-		"Not A Kerning Group" : ["A"]
+		"Not A Kerning Group" : ["A"],
+		"X": ["X", "X.sc"]
 	}
 
 	def setUp(self):
@@ -163,6 +166,20 @@ class KerningUpConversionTestCase(unittest.TestCase):
 		self.clearUFO()
 		if not os.path.exists(self.ufoPath):
 			os.mkdir(self.ufoPath)
+
+		# glyphs
+		glyphsPath = os.path.join(self.ufoPath, "glyphs")
+		if not os.path.exists(glyphsPath):
+			os.mkdir(glyphsPath)
+		glyphFile = "X_.glif"
+		glyphsContents = dict(X=glyphFile)
+		path = os.path.join(glyphsPath, "contents.plist")
+		with open(path, "wb") as f:
+			plistlib.dump(glyphsContents, f)
+		path = os.path.join(glyphsPath, glyphFile)
+		with open(path, "w") as f:
+			f.write('<?xml version="1.0" encoding="UTF-8"?>\n')
+
 		# metainfo.plist
 		metaInfo = dict(creator="test", formatVersion=formatVersion)
 		path = os.path.join(self.ufoPath, "metainfo.plist")
@@ -187,6 +204,10 @@ class KerningUpConversionTestCase(unittest.TestCase):
 				"B" : 10,
 				"CGroup" : 11,
 				"DGroup" : 12
+			},
+			"X": {
+				"A" : 13,
+				"CGroup" : 14
 			}
 		}
 		path = os.path.join(self.ufoPath, "kerning.plist")
@@ -197,7 +218,8 @@ class KerningUpConversionTestCase(unittest.TestCase):
 			"BGroup" : ["B"],
 			"CGroup" : ["C", "Ccedilla"],
 			"DGroup" : ["D"],
-			"Not A Kerning Group" : ["A"]
+			"Not A Kerning Group" : ["A"],
+			"X" : ["X", "X.sc"]  # a group with a name that is also a glyph name
 		}
 		path = os.path.join(self.ufoPath, "groups.plist")
 		with open(path, "wb") as f:
diff --git a/setup.cfg b/setup.cfg
index 35faac4f2..da9d3f3e8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 4.1.1.dev0
+current_version = 4.2.1.dev0
 commit = True
 tag = False
 tag_name = {new_version}
diff --git a/setup.py b/setup.py
index 2b93a84f8..fb017ed06 100755
--- a/setup.py
+++ b/setup.py
@@ -345,7 +345,7 @@ def find_data_files(manpath="share/man"):
 
 setup(
 	name="fonttools",
-	version="4.1.1.dev0",
+	version="4.2.1.dev0",
 	description="Tools to manipulate font files",
 	author="Just van Rossum",
 	author_email="just@letterror.com",