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I added in a few additional sources on LEDA's error checking methods and potential alternatives. I think Alternatives belongs under its own section, as has been done in similar software library articles. I placed the error checking information under Technical Details, along with an expanded discussion of LEDA's numerical representations sourced from the LEDA Book.
My overall goal is to be as broad and overreaching as possible, so let me know if you feel that I'm shifting the article too close to being a reference/manual instead of an informational overview