[Issue 3248] lossless floating point formatting

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http://d.puremagic.com/issues/show_bug.cgi?id=3248



--- Comment #8 from Stewart Gordon <smjg at iname.com> 2009-09-07 02:58:19 PDT ---
(In reply to comment #4)
> As far as I understand it, removing trailing zeros from .8 precision and (c)
> are the same.

I doubt it ... I think the optimal number of decimal s.f. would depend on the
binary exponent.  But I'll experiment when I have time.

> I remember .dig being 6 for all floats (could be wrong here, not close to any
> dmd.exe)

The spec describes .dig as "number of decimal digits of precision", which seems
ambiguous.  Is it a property of the type or the value?  If it's a type
property, is it the maximum number of s.f. that may be required to express a
number of the type unambiguously, or the number of s.f. to which numbers are
guaranteed to be storeable unambiguously?  If a value property, it is the
number of s.f. according to which of the approaches I listed, or something
else?

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