~bigbes/tarantool-protobuf: ff460b9b

wire: bypass LuaJIT NaN-boxing collision in decode_float/decode_double

Reading a NaN-payload double back through `tonumber(F.d)` runs into
LuaJIT 2.1's NaN-boxed value representation: certain IEEE NaN bit
patterns collide with internal type tags (nil, function, ...) so
`tonumber` yields a non-number and the field is silently dropped
during encoding.

Inspect the raw bit pattern via the uint32_t/uint64_t aliases of the
float/double unions before reaching for the Lua-level value. When the
exponent is all-ones we resolve Inf/NaN ourselves; only normal values
hit `tonumber`.

Closes the conformance suite's DoubleFieldNormalizeSignalingNan and
FloatFieldNormalizeSignalingNan JsonOutput tests, which used bit
patterns (0x7FFBCBA987654321, 0x7FBFFFFF) that hit the collision.

Eugene Blikh <bigbes@gmail.com> — 2026-05-16 06:14:30 UTC

Commit ff460b9b7aa9700c1648300000750e62e9108e45 — view raw patch

Parent(s): 37c56322

1 changed file(s)

File	Status	+	−
runtime/pb/wire.lua	M	+33