Fix regression and #46

Add tests for cases mentioned in https://rt.cpan.org/Public/Bug/Display.html?id=37892 that are already fixed in 1.215.
Fix regression in x operator handling that caused words like 'x86_convert' in $obj->x86_convert() to be split into 'x' operator + number 86 + 'convert'.
Fix #46 -  '1=>x' being parsed as having the x operator.