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perl -e"print 4.5 % -1.25"
0
...

\ruby\bin\ruby -e"print 4.5 % 1.25"
0.75

Prelude> 4.5 `mod` 1.25

...
      `Integral a' arising from use of `mod' at <interactive>:1:4-8
      `Fractional a' arising from the literal `4.5' at <interactive>:1
+:0-2
    Probable fix: add a type signature that fixes these type variable(
+s)