[https://stackoverflow.com/questions/18962581/why-is-it-recommended-that-i-replace-tabs-by-spaces](https://stackoverflow.com/questions/18962581/why-is-it-recommended-that-i-replace-tabs-by-spaces)
If you follow the link in the top scored answer, you will see an email thread from 1994. There are definitely pros & cons. Insisting on only either spaces or only TABs for indent in a given file might be workable in terms of preventing half & half messed up files. Choosing just one is surely the simplest approach, though.
