Because this is not a bug but rather a suggestion, I chose this path. It could be considered a question by posing it as “could this be added?”.
A useful addition to LibreOffice Calc would be a new cell fraction format. Likely not obvious to users of the metric system, but for those of us who use tape measures calibrated in inches, fractions like 4/9, 5/7, 2/5 don’t really help. It is easy to plug in decimal equivalents to common fractions and compute in decimals. But neither decimal nor the provided fraction format really provide tape compatible numbers. Inch clibrated tape measures have marks only for binary fractions 1/2, 1/4, etc. Most tapes stop at 1/16. Some rulers go to 1/128th.
A user can look up the decimal fraction in a wire and drill size conversion table but that gets old for a lot of numbers.
An ideal new format would allow the user to specify a denominator, 2, 4, 8, 16, 32, 64, or 128 and the result would be the closest fraction meeting the choice. It would be nice to be able to select closest, closest-under or closest-over.
A user could choose the binary fraction cell format, specify a precision and whether closest, under, or over, and get useful numbers found on his measuring device.