- Same functionality as Python's find(). Returns -1 if there were no occurrences.
- For indexOfBytes/indexOfCP, if the first two arguments are not strings. For indexOfArray, if the first argument is not an array.
- If either of the last two arguments are not integral.
Would like to have some operator to find character (or substring) in string. Use case - normalizing strings like server names "server1.foo.bar" to short names via $substr operator (without knowing location of first '.')