Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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When calling keto `check`, is it possible to pass in a collection of relations, of which the user (in my case the subject) needs to match at least one?

We already though about that, and also batch checks (giving you multiple results you could or)
What is your use case? Maybe you can leave a comment on <https://github.com/ory/keto/issues/812|https://github.com/ory/keto/issues/812> to help with the design

And see <https://github.com/ory/keto/issues/319#issuecomment-760204683|https://github.com/ory/keto/issues/319#issuecomment-760204683>