I have three immediate thoughts: 1. It should be `fn` or `function`; reserving a new word even if it's contextual is pointless here. 2. It should support methods. 3. It should return a closure, not a string. The reason is for consistency with methods, where we want to capture the scope at the time the closure is created, not ran. Imagine passing a private method as a callback; if it was done via `[$obj, 'privatemethod']` then it will fail at runtime, because the scope it's called in doesn't have access.
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