fonttools/Doc/bugs.txt

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Known bugs
- Font containing name table entries containing control characters
(eg. NUL bytes) can't currently be compiled. The error message is
"reference to invalid character number".
- The OT ExtensionSubst and ExtensionPos subtables are not yet
supported
- The OT FeatureParams subtable is not yet supported
- CFF/CID support fonts is currently limited
- 'kern' subtable format 2 has not been implemented properly
- The code has hardly been tested on 64-bit platforms -- there
are still some places where it assumes a long is 32 bits.