OK, I will try what you suggest and then present the result.

On 29 September 2017 at 09:40, oldk1331 <[email protected]> wrote:
> Bill, since we can't persuade each other, I suggest you to convert
> some Union("failed"..) to Maybe using 'coerce/retract', for example
> rewrite function 'recip'.
>
> Then you will find using 'coerce/retract' is verbose and unreadable.
>
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