scovich commented on PR #7783:
URL: https://github.com/apache/arrow-rs/pull/7783#issuecomment-3029466012

   > Just to clarify, the number parsing was never a hard problem... But I 
guess the tape decoder PR implements all of JSON parsing internally so that's 
great.
   
   The tape decoder presents JSON numeric values as strings. But they still 
need to be parsed. Meanwhile, I had a little too much fun playing with parsing 
code 
([playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=1b8244695bf1753c94bc5b18bd6095be)).
   
   It's a lot more efficient than the "try it and see" approach my pathfinding 
PR took. Probably a little too fancy tho (code size could cause instruction 
cache and branch prediction problems that actually hurt performance).


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