Microdescriptor consensus heading line is valid NS consensus heading line

The spec for network-status-version is:

network-status-version version ..

So additional arguments are permitted.

The spec for an MD consensus headline is:

“network-status-version” SP version [SP flavor] NL

Additional arguments are supposed to be permitted, since they're not explicitly excluded.

These syntaxes overlap. I assume that real parsers reject additional arguments for network-status-version.

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