Slinked? Slinked?!?

Okay, I know I'm not a fan of US-English standardization of irregular past tense/participle at the best of times, give me a good old-fashioned 't'-ending over 'ed' any day of the week (c.f. meant, leant, smelt, spelt - especially spelt!) but 'slinked'? 'Slinked'?!? Eeuuw!

I mean, c'mon, 'slunk' is almost physically onomatopeic, and is 'to slink' even irregular?

(It cropped up in Dana Cameron's Pack of Strays and I almost physically recoiled from it, though fortunately the rest of the English is much better).