String.space assumes the string is null-terminated

[Perelandric]

The current implementation of String.space is:

_alloc - 1

This assumes that _alloc will always be greater than _size, resulting in faulty output.

For example:

let not_null_term = String.from_iso_array(recover ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] end)

env.out.print("size: " + not_null_term.size().string())
env.out.print("space:" + not_null_term.space().string())

Output:

size: 8
space:7