Anemone's strtod still not on par with Double parser in Attoparsec

[erikd-ambiata]

Looking again at using Anemone in Walrus to parse Double values and find that stdtod fails on
strings like1.e1and 12. where there the . character is either at the end of the string or just preceding the exponent.

[amosr]

Yeah, I guess we should aim to match whatever libc strtod does. I wonder whether there's a standard for what is and is not valid.