According to the help message, both --failonwarnings+ and --failonwarnings- should be valid.
But epubcheck 5.1.0 says about them, respectively:
Unrecognized argument: "--failonwarnings+"
EPUBCheck v5.1.0
...
and
Unrecognized argument: "--failonwarnings-"
EPUBCheck v5.1.0
...
respectively.
According to the help message, both
--failonwarnings+and--failonwarnings-should be valid.But epubcheck 5.1.0 says about them, respectively:
and
respectively.