I'm not sure I understand the question. Duplicate SvcParamKeys are prohibited, even if the value is the same:
Forbidden: examplekey=examplevalue examplekey=examplevalue Repeated entries in a list-valued SvcParamValue are permissible, if allowed by the SvcParamKey definition: Forbidden: mandatory=ech,ech Ostensibly permitted but very silly and please don't: alpn=h2,h3,h2 ipv6hint=2006:db8::1,2006:db8::1 Possibly useful: example-flags=1,0,0,1 --Ben ________________________________ From: Petr Špaček <[email protected]> Sent: Thursday, October 23, 2025 7:45 AM To: dnsop <[email protected]>; Ben Schwartz <[email protected]> Subject: RFC 9460 SvcParamValue question - duplicate values Hi. RFC 9460 section D.3. Failure Cases figure Figure 16: Multiple Instances of the Same SvcParamKey in the Mandatory List got me thinking - are multiple identical values in SvcParamValue generally allowed or disallowed? I would think they are allowed because there's no requirement to order them and the check might be expensive. Am I correct? -- Petr Špaček Internet Systems Consortium
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