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u16 is an unsigned 16-bit integer, similar to the existing u8 type but wider. Operations wrap around on overflow. Values are represented as uint16_t in C, with 239 as the overlapping error value. The internal uint16 rprimitive already existed; this promotes it to a user-visible type (mypy_extensions.u16) with unboxing/boxing (CPyLong_AsUInt16), overflow errors, conversions to/from other native ints, and docs/tests similar to u8.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
p-sawicki
approved these changes
Nov 4, 2026
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u16 is an unsigned 16-bit integer, similar to the existing u8 type but wider. Operations wrap around on overflow. Values are represented as uint16_t in C, with 239 as the overlapping error value.
The internal uint16 rprimitive already existed; this promotes it to a user-visible type (mypy_extensions.u16) with unboxing/boxing (CPyLong_AsUInt16), overflow errors, conversions to/from other native ints, and docs/tests similar to u8.
The changes are mostly boilerplate.
Work on mypyc/mypyc#1226.