Lucerna.
The frozen bucketing contract (never change this):
bucket = murmur3_x86_32(utf8("#{salt}:#{unit_id}"), seed 0) % 10000Buckets are basis points in [0, 10000). Salts are stored in the
runtime, never derived from keys. Every SDK in every language must
reproduce these values bit-for-bit — the golden vectors in
sdks/core/src/vectors.json enforce it.
Summary
Functions
The unit's bucket for a salt, in basis points [0, 10000).
MurmurHash3 x86 32-bit over the UTF-8 bytes of input, as uint32.
Functions
@spec bucket(String.t(), String.t()) :: non_neg_integer()
The unit's bucket for a salt, in basis points [0, 10000).
@spec murmur3(String.t(), non_neg_integer()) :: non_neg_integer()
MurmurHash3 x86 32-bit over the UTF-8 bytes of input, as uint32.
Elixir strings are already UTF-8 binaries, so the four-byte blocks fall out of little-endian binary matching; 32-bit wraparound is emulated by masking after every multiply/add.