> i'd like to learn how rounding for display is done, some of it might be
> useful for improvements i'm thinking about.
string-to-value is, basically, the C library's strtod. ("Basically"
because there are complications like decimal comma, thousands
separators, and probably other such things.)
value-to-string is in goffice/math/go-dtoa.c and is based on musl's
printf code. It's changed to handle things like decimal comma.
As far as I know, both ways have full accuracy in the round-to-nearest
sense under two conditions: (1) a sane C library -- glibc is fine, and
(2) ieee-854 semantics of double and long double -- x86 is fine.
M.
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