If non-nil, Emacs ignores null bytes on code detection.
By default, Emacs treats it as binary data, and does not attempt to
decode it. The effect is as if you specified `no-conversion' for
reading that text.
Set this to non-nil when a regular text happens to include null bytes.
Examples are Index nodes of Info files and null-byte delimited output
from GNU Find and GNU Grep. Emacs will then ignore the null bytes and decode text as usual.