Character literals

I can do the following in my fragment shader with a nvidia 4.50 context:

int myChar = 65;
if (myChar == 'A')

Are string literals a nvidia feature or is it standard GLSL?
I can’t find anything about it in the specification.
What’s the minimum GLSL version to use character literals?

GLSL spec, section 3.1, says:

There are no character or string data types, so no quoting characters are included.

And 3.3:

Character constants are not supported.

This is almost certainly a quirk of NVIDIA’s compiler.

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