Interesting

A Ruby Class’s default ‘initialize’ method takes zero or any number or arguments depending on the version of Ruby you use.

Given the Foo class:

class Foo
end

And then attempting to instantiate an instance of Foo with arguments like so:

Foo.new('any argument')

You get an invalid number of arguments error in 1.8.7 and 1.9.3.

However, 1.9.2 and 1.9.1 will just accept any number of arguments.

Ruby spec documents this behavior:
https://github.com/rubyspec/rubyspec/blob/master/core/object/new_spec.rb

It appears that this difference between versions was introduced as a feature in 1.9.2 and back ported to 1.9.1 and then reverted in 1.9.3. Perhaps the reversion should be back ported now?
http://redmine.ruby-lang.org/issues/2451

Help

Does anyone know of an API that provides a sales tax lookup service?