In general you should aim to localise the understanding of the code to the current context. By that I mean, the bit of code you are looking at now should be written so its purpose is clear without having to refer to other materials.
Generally that means rewriting something like:
setOptions (1, 0, 'e');
as:
setOptions (send_log => 1, suppress_warnings => 0, max_level => 'e');
A little more verbose, but now (even without the context) it's pretty clear what the parameters do and what setOption is likely to achieve.
Or to paraphrase a great man: make your code as clear as possible, but no clearer :).
DWIM is Perl's answer to Gödel
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