packTab release notes

1.9.0

default=None is now treated as an ordinary value (for example, mapped to an integer via mapping), restoring its use as a real sentinel such as HarfBuzz's "no decomposition" entry. To request an inferred default from the boundary values, pass the new sentinel default=NotImplemented (list input only). The default remains 0, so existing callers are unaffected unless they relied on default=None to trigger inference (added in 1.5.0).

Fix the inline-constant lookup path miscompiling values that need 16 bits or more; this could produce wrong C/Rust output at the default compression.
Size the generated return type to also hold default, so negative or oversized defaults are returned correctly instead of wrapping (C) or failing to compile (Rust).
compression >= 10 (and --optimize-size) now returns the true minimum-byte solution; deep low-byte splits were previously pruned before selection. compression 1..9 picks are unchanged.
Fix the palette lookup ignoring its shared-array start offset when more than one palette solution is emitted into a single Code.
Fix odd-length non-integer (e.g. string) tables leaking the internal padding element as the out-of-range value instead of the default.
Odd-length flat tables no longer emit an unreachable trailing "dead" byte.
Repair Code.print_h, which previously raised AttributeError.
--analyze's Score column now matches the highlighted best solution (exact log2 instead of a floored approximation).

Earlier history is available in the git log and release tags.