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Not yet complete, but looks rather promising (seems to be have similar origin as the implementation in libcmini).
Already adjusted for mintlibs purpose (provides the _internal* functions needed by scanf()). Does hot handle group separators or locales yet (but that is also the case in current implementation).
Whats missing:
Both should not be hard to implement.
What would regress: the algorithm does not parse strings that would result in denormals. There may also be differences in the least significant bit due to rounding.
The functions currently generate ~1K of code, including the tables, with only minimal references to libgcc.a for some float functions in the 68k version.