The array to scan. This parameter is not marked 'ref' to allow temporary slices to be modified. As buf is not resized in any way, omitting the 'ref' qualifier has no effect on the result of this operation, even though it may be viewed as a side-effect.
The evaluation predicate, which should return true if the element satisfies the condition and false if not. This predicate may be any callable type.
The number of elements that do not satisfy pred.
Performs a linear scan of buf from [0 .. buf.length$(RP), moving all elements that satisfy pred to the end of the sequence. The relative order of elements that do not satisfy pred will be preserved.