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perf: reduce the bsb22 hash-to-field buffer in two halves - #33
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from_le_bytes_mod_order converts only the leading modulus_bytes minus one bytes directly, then folds each remaining byte through a field multiply and add. A 48-byte buffer runs 17 of those steps. Two 24-byte halves stay under the direct-conversion limit and recombine with one multiply and one add.
BSB22 verify drops from 211,461 to 144,138 CU at one public input. Plain Groth16 is unchanged.