[Proj] Arbitrary precision floating point library

[Even Rouault]

Hi,

In case we'd need angström accuracy someday, I just came accross
https://bellard.org/libbf/  
" LibBF is a small library to handle arbitrary precision floating point numbers. Its 
compiled size is about 60 KB of x86 code and has no dependency on other 
libraries. [...] Easy to embed (a few C files need to be copied). [...] MIT license."

I didn't try it, but the credibility of its author, Fabrice Bellard, is enormous : 
https://en.wikipedia.org/wiki/Fabrice_Bellard

Even

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