[quicwg/base-drafts] MAX_PUSH_ID: lower-than-previous value conn error seems to severe (#2412)

[Lucas Pardue <[e-mail]>]

The 18 spec says:

> A MAX_PUSH_ID frame cannot reduce the maximum Push ID; receipt of a MAX_PUSH_ID that contains a smaller value than previously received MUST be treated as a connection error of type HTTP_MALFORMED_FRAME.

This feels like another case of an error that isn't strictly a frame error. Its the data inside that is semantically wrong. The connection error severity also seems pretty extreme, and I question if its really needed. I think the appropriate fix is to borrow logic from the Transport's similar MAX_STREAMS frame:

> Loss or reordering can cause a MAX_STREAMS frame to be received which
   states a lower stream limit than an endpoint has previously received.
   MAX_STREAMS frames which do not increase the stream limit MUST be
   ignored.

The proposal therefore is to say that MAX_PUSH_ID can only increase the value, anything else gets ignored.

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