To explain 'why' it behaves this way is quite simple the stdlib does not have slicing operators for all of your expected cases, Nim does not have postfix operat

To explain 'why' it behaves this way is quite simple the stdlib does not have slicing operators for all of your expected cases, Nim does not have postfix operators(aside from [], {}, *) so 3.. is just impossible to define. If one really wanted to https://play.nim-lang.org/#ix=4nSQ https://play.nim-lang.org/#ix=4nSQ solves most of the issues.