Creates a new GString with len bytes of the init buffer.
Because a length is provided, init need not be nul-terminated,
and can contain embedded nul bytes.
Since this function does not stop at nul bytes, it is the caller's
responsibility to ensure that init has at least len addressable
bytes.
Creates a new GString with len bytes of the init buffer. Because a length is provided, init need not be nul-terminated, and can contain embedded nul bytes. Since this function does not stop at nul bytes, it is the caller's responsibility to ensure that init has at least len addressable bytes.