It looks like it's not possible to mix CompatVersions for overloads of a method.

What I mean by this: in #979, I wanted to say

@JRubyMethod(name = "count", compat = CompatVersion.RUBY1_8)
public static IRubyObject count18(ThreadContext context, IRubyObject self, final Block block) {
    // snip
}

@JRubyMethod(compat = CompatVersion.RUBY1_9)
public static IRubyObject count(ThreadContext context, IRubyObject self, final Block block) {
    //snip
}

@JRubyMethod
public static IRubyObject count(ThreadContext context, IRubyObject self, final IRubyObject methodArg, final Block block) {
    //snip
}

and have the version which takes method arg apply to all CompatVersions.

But until I explicitly declared this function with both a CompatVersion.RUBY1_8 and CompatVersion.RUBY1_9, JRuby was convinced that there was no count method that took an argument (i.e. the with-args count didn't get registered when declared like this).

Am I misunderstanding something here? Or is this something that would be nice to support?