Return the power of {x} to the exponent {y} as a |Float|. {x} and {y} must evaluate to a |Float| or a |Number|. Returns 0.0 if {x} or {y} is not a |Float| or a |Number|. Examples: :echo pow(3, 3) 27.0 :echo pow(2, 16) 65536.0 :echo pow(32, 0.20) 2.0 Can also be used as a |method|: Compute()->pow(3) {only available when compiled with the |+float| feature}