Validating can.Map with "errors" attribute modifies the value of the attribute

[fantanamihai]

Example:
can.Map.extend('Test', { define: { errors: { value: null, validate: { required: true } } } })
a = new Test()
a.validate() = false
a.attr('errors') - should be null
The cause is the current implementation of validate method, which assigns to errors attribute the eventual error object/messages returned by the 3rd party validation library.