Accurate number parsing

[9il]

Current implementation has inaccurate number parsing.

How to Read Floating Point Numbers Accurately by William D. Clinger - a classic paper on number parsing.

[beached]

This is currently being looked at and has some patching
#182

[beached]

Number parsing has a precise mode now, but performance has not been optimized

[benstadin]

What is the performance penalty roughly when setting options::IEEE754Precise? And does setting this option address the issue entirely?

[beached]

Depends on the system, but the cost of from_chars if it supports FP. I am currently working on implementing https://arxiv.org/abs/2212.06644 which should largely remove most of the cost.