[swift-evolution] [pitch] make @nonobjc the default

[Jay Abbott]

Currently, if you extend a class that comes from obj-c, Swift assumes you
want to make those methods available to call from obj-c code. If you add
operators, you must declare them as @nonobjc otherwise the bridging header
which is generated declares obj-c methods with the operator character as
the method name, which isn't valid in obj-c and causes compile errors.

I'm just wondering how others feel about this - my feeling is that a Swift
developer should not have to know anything about obj-c when doing Swifty
things to a bridged class from a framework (such as extending it). As far
as they are concerned the framework class should compile the same as if it
were fully implemented in Swift.

Thoughts?
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