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[Cbor] Tag for Number as String?

"David E. Wheeler" <david@justatheory.com> Thu, 17 April 2025 15:49 UTC

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From: "David E. Wheeler" <david@justatheory.com>
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Date: Thu, 17 Apr 2025 11:49:28 -0400
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Subject: [Cbor] Tag for Number as String?
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Hello,

An app I’m working on makes use of the Go JSON decoder’s UseNumber[1] option to decode number values into a string subtype, json.Number[2]. I’d like to keep these values as json.Numbers when round-tripping through CBOR encoding and decoding, and a custom tag works very well[3]. I used 80000, since the registry[4] marks it as reserved for private use, but I’m wondering whether it would be generally useful to register a tag for “number as string” that implementations can then interpret appropriately. Thoughts?

If so, I’d be happy to write up a more formal proposal.

Best,

David

[1]: https://pkg.go.dev/encoding/json#Decoder.UseNumber
[2]: https://pkg.go.dev/encoding/json#Number
[3]: https://github.com/fxamacker/cbor/issues/441#issuecomment-2813294047
[4]: https://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml

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