Feature #21308
open
Replacing the Float#to_s (dtoa.c) implementation with a modern algorithm
Description
This is a feature request to replace Ruby's Float#to_s implementation with a modern high-performance float-to-string conversion algorithm such as Grisu.
Currently, Float#to_s in Ruby uses the BSD-derived implementation in missing/dtoa.c.
Meanwhile, json gem has adopted a Grisu-based implementation in ruby/json#768, it has been improve the performance of float-to-string conversion dramatically.
It appears to have brought about a 10 times improvement in performance.
However, the improvement is limited to the json gem.
If we can use the same implementation in Float#to_s, it will introduce the improvement in all float-to-string conversion cases.
(In additional, it would be better if an API could be added that could be called directly from the C extension library, it will reduce the overhead of the call.)
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