Sourced from fonttools's releases.

4.63.0

• [ttLib] Add support for Apple Color Emoji bgcl table (#4065).
• [ttLib] Add support for IFT and IFTX tables (Incremental Font Transfer, PatchMapFormat2) (#4070, #4072).
• [otData] Introduce FieldSpec dataclass for OpenType table schema definitions, replacing raw tuples in otData.py (#4076).
• [Feat] Show name table strings as comments next to label IDs in TTX output, matching the convention used by fvar, STAT, trak (#4089).
• [cu2qu] Fix Cython complex-division rounding difference in split_cubic_into_three that could cause ±1 off-curve coordinate shifts (#3928, #4083).
• [designspaceLib] Fix map_backwardgooglefonts/ufo2ft#978#4085).
• [OS/2] Fix setUnicodeRanges to accept reserved bits 123-127, restoring round-trip with getUnicodeRanges and fixing recalcUnicodeRanges crash in the subsetter (#4087, #4088).
• [cython] Declare Cython extensions as free-threading compatible on Python 3.13+, so that importing them on free-threaded Python no longer re-enables the GIL (#4073, #4090).

Sourced from fonttools's changelog.

4.63.0 (released 2026-05-14)

• [ttLib] Add support for Apple Color Emoji bgcl table (#4065).
• [ttLib] Add support for IFT and IFTX tables (Incremental Font Transfer, PatchMapFormat2) (#4070, #4072).
• [otData] Introduce FieldSpec dataclass for OpenType table schema definitions, replacing raw tuples in otData.py (#4076).
• [Feat] Show name table strings as comments next to label IDs in TTX output, matching the convention used by fvar, STAT, trak (#4089).
• [cu2qu] Fix Cython complex-division rounding difference in split_cubic_into_three that could cause ±1 off-curve coordinate shifts (#3928, #4083).
• [designspaceLib] Fix map_backward for many-to-one (flat-segment) axis maps that silently dropped entries via dict comprehension googlefonts/ufo2ft#978#4085).
• [OS/2] Fix setUnicodeRanges to accept reserved bits 123-127, restoring round-trip with getUnicodeRanges and fixing recalcUnicodeRanges crash in the subsetter (#4087, #4088).
• [cython] Declare Cython extensions as free-threading compatible on Python 3.13+, so that importing them on free-threaded Python no longer re-enables the GIL (#4073, #4090).

• 978d9ed Release 4.63.0
• 6b40ecb Add changelog entries for 4.63.0
• 382a35f Merge pull request #4090 from fonttools/fix-freethreading-compat
• 0e999b5 Declare Cython extensions as free-threading compatible
• 9e55ea5 Merge pull request #4089 from fonttools/graphite-feat-labels
• e84db3a Merge pull request #4088 from fonttools/fix-setUnicodeRanges-bits-123-127
• d6eabd1 Feat: show name table strings as comments next to label IDs in ttx
• 7d0902b OS/2: fix setUnicodeRanges round-trip for reserved bits 123-127
• 06e266c Merge pull request #4085 from fonttools/fix-map-backward-non-injective
• 6d64598 Add more tests for map_backward with many-to-one axis maps
• Additional commits viewable in compare view

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