Binding passed to set_trace_func callback has a wrong type

Try to run the following code.

set_trace_func proc { |_, _, _, _, binding, _|
  p binding.class
  p eval("local_variables", binding)
}
a = 5

Output:

Object
TypeError
Exception in thread "main" Array

Object, should be Proc or Binding. It is blocker for the debuggers and similar applications.

duplicates

JRUBY-361 Wrong argument type for trace function - name of scope instead of binding

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