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There are also technical challenges.
* Compilation is slow.
* [https://gist.github.com/zbraniecki/b251714d77ffebbc73c03447f2b2c69f Crossing the C++/Rust boundary can be difficult].
See "Blockers and obstacles" below for more details about work being done to remedy these weaknesses.
* Japanese encoding detector: {{bug|1543077}} (shipped in Firefox 69)
** '''Why Rust?''' Builds upon encoding_rs, has tiny FFI surface, subject matter prone to accesses past the bounds of a buffer.
* Unicode Language Identifier: {{bug|1571915}} (shipped in Firefox 72)
** '''Why Rust?''' Much faster, parser-heavy, easier to handle low-memory footprint thanks to `tinystr`.
* Language Negotiation: {{bug|1581960}} (shipped in Firefox 72)
** '''Why Rust?''' Ties into `unic-langid`, easier to handle list filtering and ordering.
=== In progress ===
