Returns a Seq.Indexed of value repeated times times. When times is
not defined, returns an infinite Seq of value.
Repeat<T>(value: T, times?: number): Seq.Indexed<T>
Note: Repeat is a factory function and not a class, and does not use the
new keyword during construction.
const { Repeat } = require('immutable')
Repeat('foo') // [ 'foo', 'foo', 'foo', ... ]
Repeat('bar', 4) // [ 'bar', 'bar', 'bar', 'bar' ]