Will a wire have increased current capacity if the length is sufficiently small?
The reason I'm asking is that when doing PCB layout the vias often has thermal relief, which are small traces going from the via to track/fill around. But I've heard that because it's so short it doesn't really matter.
Is this true and can it be further extended to very short wires, or must you follow the rating of the wire?
If possible, how would one 'prove' that the wire can actually handle the current?