nx_zstd_seqtab.nx

nx_zstd_seqtab.nx -- Zstandard's three PREDEFINED sequence distributions. These are spec DATA, transcribed from RFC 8878 rather than reconstructed -- a distribution that is merely plausible produces a decoder that looks right and disagrees with every other zstd implementation on real files. A NEGATIVE ONE IS A REAL ENTRY, NOT A TERMINATOR. In an FSE normalized count, -1 means "less than one in this table": the symbol is present, it occupies a single low-probability slot, and it counts as ONE toward the total. Dropping the -1 entries -- the obvious reading, since they look like end markers -- leaves the counts short of the table size and the build refuses, which is the good outcome. Treating them as zero is the bad one: the rarest symbols become undecodable and only some files break. THE SUM IS THE TRANSCRIPTION CHECK. Each distribution must total exactly its table size -- 64, 64 and 32 -- and nx_fse_build_dtable enforces that. A single mistyped digit almost always breaks the sum, so a successful build is meaningful evidence the numbers are right, not just that they parse. genealogy_id: rfc8878_default_distributions lineage_id: nx_zstd_seqtab_v1 license_tier: ORIGINAL