fill.go

// https://github.com/golang/go/blob/go1.24.0/src/bytes/bytes.go#L664-L673
func fill[T comparable](buf []T, value T) {
	var zero T
	switch {
	case value == zero:
		clear(buf)
	case len(buf) != 0:
		buf[0] = value
		maxChunk := 8 * 1024 / unsafe.Sizeof(value)
		for i := 1; i < len(buf); {
			chunk := min(i, int(maxChunk))
			i += copy(buf[i:], buf[:chunk])
		}
	}
}