[quicwg/base-drafts] Don't levy requirements on non-QUIC TLS endpoints (#2174)

[ekr <[e-mail]>]

Section 8.2 says:

```
Endpoints MUST NOT send this extension in a TLS connection that does not use
QUIC (such as the use of TLS with TCP defined in {{!TLS13}}).  A fatal
unsupported_extension alert MUST be sent if this extension is received when the
transport is not QUIC.
```

However, this directly contradicts TLS 1.3 https://tools.ietf.org/rfcmarkup?doc=8446#section-4.1.2, which says:

```
Servers MUST ignore unrecognized extensions.
```

In order to say this, this document would need to Update 8446, and even then it doesn't make sense because the presumptive point of this rule is to detect attempts to negotiate QUIC with non-QUIC TLS endpoints, which don't need to conform to this RFC (and may predate it).



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