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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.