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Add IEEE 754 compliant fmt/parse of -0, infinity, NaN #78618

Merged
merged 5 commits into from
Mar 27, 2021
Merged

Add IEEE 754 compliant fmt/parse of -0, infinity, NaN #78618

merged 5 commits into from
Mar 27, 2021

Commits on Mar 23, 2021

  1. Add IEEE754 tests

    @workingjubilee
    workingjubilee committed Mar 23, 2021
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  2. Add ability to read NaN/Infinity

    @workingjubilee
    workingjubilee committed Mar 23, 2021
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  3. Preserve signed zero on roundtrip 

    This commit removes the previous mechanism of differentiating
between "Debug" and "Display" formattings for the sign of -0 so as
to comply with the IEEE 754 standard's requirements on external
character sequences preserving various attributes of a floating
point representation.

In addition, numerous tests are fixed.
    @workingjubilee
    workingjubilee committed Mar 23, 2021
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  4. Update signed fmt/-0f32 docs 

    "semantic equivalence" is too strong a phrasing here, which is why
actually explaining what kind of circumstances might produce a -0
was chosen instead.
    @workingjubilee
    workingjubilee committed Mar 23, 2021
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  5. Rephrase -0.0 docs

    @workingjubilee
    workingjubilee committed Mar 23, 2021
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