Wart(s) to check for StringOps#toInt etc.

[nigredo-tori]

In a similar vein to OptionPartial and TryPartial, we can check for non-total conversions from String to primitive types:

// This throws
"foo".toInt
// This forces the code to handle the failure
"foo".toIntOption

Offending methods in scala.collection.StringOps are toBoolean, toByte, toDouble, toFloat, toInt, toLong and toShort.

Note that this wart would be specific to Scala 2.13, since that's when we got the to*Option syntax.

[ashleymercer]

Just thinking out loud: the wart wouldn't necessarily need to be specific to 2.13 - although it might be useful to tailor error messages to something like:

For Scala <=2.12 you should use `Try(foo.toInt)`, for Scala >= 2.13 use `foo.toIntOption`

(or possibly for forwards-compatibility, suggest Try(foo.toInt).toOption for <=2.12?)