I've heard all sorts of arguments for and against, but in the end it only matters that you consistently choose only tabs or spaces, and that you use whatever he

I've heard all sorts of arguments for and against, but in the end it only matters that you consistently choose only tabs or spaces, and that you use whatever header-settings your IDE provides to enforce the decision across all the coders, e.g. for emacs: #!/usr/bin/ruby -w #-*- standard-indent: 2; indent-tabs-mode: nil; -*- [...]