Though long a user of user functions, today I ran face first into a 
parameter naming trap which had me tangled up for hours. Though perhaps 
not too surprising in hindsight, thought I'd pass along the lesson learned.

Fn0 = function (x,y,z) {...} // OK. Pass anything you want for x,y,z.

Fn1 = function (v) {...} // OK. Pass anything you want for v.

Fn2 = function (x,y,z,v) // Boom! What you pass for v overwrites y.

Looks to be related to u and v being synonyms for x and y. Something like:

Fn3 = function (x,y,z,_v) {...} // OK. Pass what you want.

Bill P.

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