line length violations in documentation
Prefer single-quoted strings

when you don't need string interpolation or special symbols  such as
\t, \n, ', etc.
line length violations
Indent when as deep as case
Use alias_method instead of alias
line length violations
indentation
Surrounding space missing
line length violations
Avoid single-line method definitions
Unused method argument
line length violations
Avoid single-line method definitions
Use fail instead of raise to signal exceptions

Redundant RuntimeError argument can be removed
line length violations
WIP #mail is too many lines