If the difference is negative, numbers round improperly

[AngelTomkins]

Expected Behavior

Subtracting decimals should round properly. Eg,

0.2 - 0.3 = -0.1

Current Behavior

When subtracting decimals, if the subtrahend is larger than the minuend, the difference will be rounded improperly.

0.2 - 0.3 = -0.09999999999999998

Weirdly enough it works properly with the tenth less in both the minuend and the subtrahend: 0.1 - 0.2 = -0.1

Possible Solution

Probably just the mathfloor/mathceiling

Steps to Reproduce (for bugs only)

See above

Context

The calculator gives an incorrect difference, which is important for accuracy

Environment

Tested on both Arch Linux desktop and Arch Linux Arm on Pinephone

• Version used: 1.3.0-1
• Operating system and version: Arch Linux and Arch Linux Arm