One funny anecdote: I once did a similar cleanup on a codebase that was mostly spaces, but a few tabs slipped in. (I just did a find and replace on \t -> "

One funny anecdote: I once did a similar cleanup on a codebase that was mostly spaces, but a few tabs slipped in. (I just did a find and replace on \t -> " ") Suddenly, one unit test broke. On closer inspection, whoever wrote it put a tab character into a string. I changed the test to use \t.