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format(mp.mpf(0.99999), '.4f') returns '0.99999' #858

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format(mp.mpf(0.99999), '.4f') returns '0.99999'#858
#859
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bugan unexpected problem or unintended behavior
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1.4
@skirpichev

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@skirpichev
skirpichev
opened on Aug 31, 2024

Should be '1.0000'.

I would guess this is related to "a hack" here:

mpmath/mpmath/libmp/libmpf.py

Lines 1519 to 1522 in 9d9029a

# Hack: if the digits are all 9s, then we will lose one dps when rounding
# up.
if all(dig == stddigits[base-1] for dig in digits[:dps+1]):
dps += 1

CC @javierelpianista

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