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A version of extract_stack that only returns filenames and line numbers.

Callers often only require filenames and line numbers, and do not need the additional information gathered by extract_stack, as they never call convert_stack.

As a further optimisation, we allow users to specify a limit on the number of frames examined.

max_length The maximum length of stack to extract.

A list of FileAndLine objects corresponding to the call stack of the current thread.