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faf5ae0c2f
Make a function to create a filter. This is a pod that has all valid
defaults fixated and the invalid ones left unfixated.
Use this filter is a first attempt to negotiate a link format. The
effect is that a format will be chosen first that matches all the valid
defaults as much as possible instead of negotiating to the first thing
that matches.
Suppose we have a higher priority port with the format:
foo/bar
key: { default:1024, min:1, max:2048 }
And another port with two params:
foo/bar
key: 512
rate: 2/1
foo/bar
key: 1024
rate: 30/1
By first trying key: 1024 we negotiate to the more specific second property
with the higher rate.
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