I don’t think this rounding is needed

Lib/fontTools/pens/svgPen.py

@@ -2,47 +2,8 @@ from __future__ import print_function, division, absolute_import
 from fontTools.misc.py23 import *
 from fontTools.pens.basePen import BasePen
 
-# Number to String Conversion
-
-def valueToString(v):
-    """
-    >>> valueToString(0)
-    '0'
-    >>> valueToString(10)
-    '10'
-    >>> valueToString(-10)
-    '-10'
-    >>> valueToString(0.1)
-    '0.1'
-    >>> valueToString(0.0001)
-    '0.0001'
-    >>> valueToString(0.00001)
-    '0'
-    >>> valueToString(10.0001)
-    '10.0001'
-    >>> valueToString(10.00001)
-    '10'
-    """
-    if int(v) == v:
-        v = "%d" % (int(v))
-    else:
-        v = "%.4f" % v
-        # strip unnecessary zeros
-        # there is probably an easier way to do this
-        compiled = []
-        for c in reversed(v):
-            if not compiled and c == "0":
-                continue
-            compiled.append(c)
-        v = "".join(reversed(compiled))
-        if v.endswith("."):
-            v = v[:-1]
-        if not v:
-            v = "0"
-    return v
-
 def pointToString(pt):
-    return " ".join([valueToString(i) for i in pt])
+    return " ".join([str(i) for i in pt])
 
 class SVGPen(BasePen):
 
@@ -130,11 +91,11 @@ class SVGPen(BasePen):
         # vertical line
         elif x == self._lastX:
             cmd = "V"
-            pts = valueToString(y)
+            pts = str(y)
         # horizontal line
         elif y == self._lastY:
             cmd = "H"
-            pts = valueToString(x)
+            pts = str(x)
         # previous was a moveto
         elif self._lastCommand == "M":
             cmd = None