topazproject/topaz — pull request #390 by jstepien (2013-02-17 10:00:14+00:00)
Title: String#insert

String#insert with index, other
- inserts other before the character at the given index
- modifies self in place
- inserts after the given character on an negative count
- raises an IndexError if the index is beyond string
- converts index to an integer using to_int
- converts other to a string using to_str
- raises a TypeError if other can't be converted to string

`String#insert` is necessary to run core/process/kill_spec.rb.