Provide an option that enforces the documented syntax for Closure Compiler type expressions

[pigulla]

Unless the jsdoc option is set, the following code should throw an exception because the type expression null|function is invalid (type unions must be within parentheses):

var catharsis = require('catharsis');

catharsis.parse('null|function()');

As I understand it, this behaviour was introduced in #8.

[hegemonic]

Catharsis always accepts these type unions as valid because Closure Compiler does, too. Similarly, both Catharsis and Closure Compiler allow the nullable (?) and non-nullable (!) operators to be used in postfix form (for example, string!). See #20 for more background.

That said, I'm open to adding a new option (perhaps called strict) that only accepts the documented syntax for type expressions. I can imagine how that might be useful for a style-checking tool.

I probably won't implement this anytime soon, but I'd welcome a pull request for the feature.

[hegemonic]

Closing this due to lack of interest.