A predicate for mutable vectors. Implies vector?.
Constructs a reducer that collects at most size elements of a sequence into an immutable vector.
(into-mutable-vector [#:size size])
→ (reducer/c any/c mutable-vector?) size : (or/c natural? +inf.0) = +inf.0
Constructs a reducer that collects at most size elements of a sequence into a mutable vector.
Copies seq into an immutable vector. If seq is already an immutable vector, it is returned directly.