questions about NetBSD port

[Walter Bright via Digitalmars-d]

On 2/3/2016 11:41 PM, Iain Buclaw via Digitalmars-d wrote:
> Actually, I found the reverse! One of the inline assembly version paths are
> correct up to double precision, the platform agnostic path I ported does not
> have this problem, but fails the tests.
>
> Adjusting them will *expose* the buggy algorithm for what it really is.
>

I don't understand. How can reducing precision of the test expose bugs?