Rounding is:exact

"Rounding strategy" - how to apply an AmountStyle's display precision to a posting amount (and its cost, if any). Mainly used to customise print's output, with --round=none|soft|hard|all.

Rounding rationals to significant digits and decimal places. The round function from the prelude returns an integer. The standard librarys of C and C++ have round functions that return floating point numbers. Rounding in this library takes and returns Rationals and can round to a number of significant digits or a number of decimal places.