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in reply to Re^3: On Coding Standards and Code Reviews
in thread On Coding Standards and Code Reviews

I'm not sure allowing each developer to set their own indentation level works very well in teams doing pair programming. FWIW, Michael G Schwern holds the same view as Damian:

Here's all I have to say about tabs. I expect the source to look the same no matter whose editor, pager, printer or utility I run it through. Literal tabs violate this. The end.
I also notice that the Parrot coding standard mandates that "Indentation must consist only of spaces".

Though I agree with Conway and Schwern on this, the main reason I chose spaces over TABs is that is we currently do that (mostly), and I don't want to change over a million lines of legacy code. :-)