From type/Rational

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method floor(Rational:D: --> Int:D)

Return the largest integer not greater than the invocant. If denominator is zero, fail with X::Numeric::DivideByZero.

From type/Real

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method floor(Real:D: --> Int:D)

Return the largest integer not greater than the number.

From type/Cool

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multi sub floor(Numeric(Cool))
multi method floor

Coerces the invocant (or in sub form, its argument) to Numeric, and rounds it downwards to the nearest integer.

say "1.99".floor;       # OUTPUT: «1␤» 
say "-1.9".floor;       # OUTPUT: «-2␤» 
say 0.floor;            # OUTPUT: «0␤»

From type/Complex

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method floor(Complex:D: --> Complex:D)

Returns self.re.floor + self.im.floor. That is, each of the real and imaginary parts is rounded to the highest integer not greater than the value of that part.

say (1.2-3.8i).floor;           # OUTPUT: «1-4i␤»