korovkind/git-plugin — comment on commit c74e966d7e928acbda02c1fd74b7a0a371e9baf6
File: src/main/java/hudson/plugins/git/GitSCM.java line 268
By ndeloof:

may validate the entered value is a valid Charset, or even declare the attribute/parameter as a java.nio.Charset if supported by stapler converters