From type/Rational

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method ceiling(Rational:D: --> Int:D)

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

From type/Real

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method ceiling(Real:D: --> Int:D)

Returns the smallest integer not less than the number.

From type/Cool

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multi sub ceiling(Numeric(Cool))
multi method ceiling

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

say "1".ceiling;        # OUTPUT: «1␤» 
say "-0.9".ceiling;     # OUTPUT: «0␤» 
say "42.1".ceiling;     # OUTPUT: «43␤»

From type/Complex

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

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

say (1.2-3.8i).ceiling;         # OUTPUT: «2-3i␤»