Why does bootstrap subtract 0.02px in media query?

Question

css

Hello, having searched Google, I could not find an explanation for why the @include media-breakpoint-down(...)
admixture Subtracts 0.02px from the breakpoint and it is in queries where max-width is used that is some kind of optimization or what is it for? Here is an example from the documentation . Thanks in advance

Answer 1

So that there are no problems with inheritance, but the entire range is covered, including for fractional values.

Answer 2

Note that because browsers do not currently support range queries, we enforce min- and max- prefixes limits on prefixes and fractional-width viewports (which can happen under certain conditions on high-dpi devices, for example) using values with higher precision for these comparisons.