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rustdoc-search: tighter encoding for
f
index
Two optimizations for the function signature search: * Instead of using JSON arrays, like `[1,20]`, it uses VLQ hex with no commas, like `[aAd]`. * This also adds backrefs: if you have more than one function with exactly the same signature, it'll not only store it once, it'll *decode* it once, and store in the typeIdMap only once. Size change ----------- standard library ```console $ du -bs search-index-old.js search-index-new.js 4976370 search-index-old.js 4404391 search-index-new.js ``` ((4976370-4404391)/4404391)*100% = 12.9% Benchmarks are similarly shrunk: ```console $ du -hs tmp/{arti,cortex-m,sqlx,stm32f4,ripgrep}/toolchain_{old,new}/doc/search-index.js 10555067 tmp/arti/toolchain_old/doc/search-index.js 8921236 tmp/arti/toolchain_new/doc/search-index.js 77018 tmp/cortex-m/toolchain_old/doc/search-index.js 66676 tmp/cortex-m/toolchain_new/doc/search-index.js 2876330 tmp/sqlx/toolchain_old/doc/search-index.js 2436812 tmp/sqlx/toolchain_new/doc/search-index.js 63632890 tmp/stm32f4/toolchain_old/doc/search-index.js 52337438 tmp/stm32f4/toolchain_new/doc/search-index.js 631150 tmp/ripgrep/toolchain_old/doc/search-index.js 541646 tmp/ripgrep/toolchain_new/doc/search-index.js ```
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