Problem: Recognizing octal numbers is confusing.
Solution: Introduce scriptversion 4: do not use octal and allow for single
quote inside numbers.
60a8de28d1
:scriptversion is N/A.
Cherry-pick Test_readfile_binary() from v8.1.0742.
Note that this patch was missing vim_str2nr() changes, and so fails the
tests; this was fixed in v8.1.2036.