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Does mergenewparams repeatedly hit a WMS server if you change the layer name?

For example, you call the server with layer 'a' then you use mergewnewparams and call layer 'b', then you use mergewnewparams and call layer 'a' again. Does it cache layer 'a' or request a new layer 'a' ?

I'm actually using a tilecache, but I assume it works the same for either.

Thanks!

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