Commits on Jun 18, 2024

1. Add Farm Hash conditioned upon nimPreviewHashFarm as 64-bit Hash- …

   actually filling hash function for `string` & related.
   
   For the curious, note that `hashData` remains the aboriginal Nim string
   hasher & `import hashes {.all.}` allows simultaneous test/time of {orig,
   murmur, farm} on your favorite CPU & back end compiler.
   
   Update tests also conditioned upon `nimPreviewHashFarm` so they should
   pass either with or without that `define` on.
   
   In `--jsbigint=on` mode, only the lower 32-bits of `Hash` match nimvm &
   run-time values because `type Hash = int` and on JS int=int32, not int64
   as for 64-bit Nim platforms.  Due to the matching, `const` Table should
   match run-time `Table` on all platforms.
   
   To operate in `--jsbigint=off` mode is feasible but needs much "double
   precision mul/xor/ror/shr-arithmetic"-style work.  That is distracting &
   also of questionable value since JS added BigInt in 2018, ringabout
   added Nim support for it in 2021 & `nimPreviewHashFarm` is unlikely to
   swap from an opt-in to an opt-out default before 2025..2026 which will
   have given a backward looking time window of 7..8 years for deployment
   platforms - reasonably generous.
   
   Add a changelog entry for 2.2.

   

   c-blake committed Jun 18, 2024
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2. Address nim-lang#23735 (review) …

   and simplify/clarify the language a little while doing so.

   

   c-blake committed Jun 18, 2024
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