Added type description to errors when using --arg #263
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What
Adding what type (Symbol, Byte, etc) a specified argument via the --arg option is trying to be parsed into, and if a parsing error occurs, include it in the error output to provide a hint as to why the arg is unable to be parsed.
Why
Currently, there's a very general and unhelpful error if an error occurs when parsing a val to type.
Known limitations
A simple change, basically to show more error information when specifing --arg.