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This provides a 'meatier' version of caller:
caller_cv($level)
caller_cv gives you the coderef of the subroutine being invoked
at the call frame indicated by the value of $level
caller_args($level)
Returns the arguments passed into the caller at level $level
caller_vars( $level, $names ) =item called_with($level, $names)
called_with returns a list of references to the original
arguments to the subroutine at $level. if $names is true, the
names of the variables will be returned instead
constants are returned as undef in both cases
called_as_method($level)
called_as_method returns true if the subroutine at $level was
called as a method.
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