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Not affected: user apps that don't decode CBOR null or undefined enclosed in tag number 55799 (e.g. 55799(null)) to a pointer or interface value. Tag number 55799 has no semantics (RFC 8949 Section 3.4.6), so 55799(null) should decode the same as null. Previously, decoding 55799(null) set a nil pointer to a new zero value, and let a non-nil pointer or interface keep its value. This commit decodes 55799(null) the same as null, setting a pointer and interface to nil. It also allows 55799 enclosing a registered tag to be decoded to an interface implemented by the registered type.
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Port #851 from release-2.9 to master
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Not affected: user apps that don't decode CBOR null or undefined enclosed in tag number 55799 (e.g. 55799(null)) to a pointer or interface value.
Tag number 55799 has no semantics (RFC 8949 Section 3.4.6), so
55799(null)should decode the same asnull. Previously, decoding55799(null)set a nil pointer to a new zero value, and let a non-nil pointer or interface keep its value.This PR decodes
55799(null)the same asnull, setting a pointer and interface to nil. It also allows 55799 enclosing a registered tag to be decoded to an interface implemented by the registered type.