matchesStringValue doesn't match exactly on tokens

[reshmakh]

matchesStringValue doesn't match exactly on token search params.

Came up in the context of this Access Policy in staging environment.

[codyebberson]

See https://github.com/medplum/medplum/blob/main/packages/core/src/search/match.ts

[Shield01]

Hi, @codyebberson This is my first time contributing to Medplum, and I would like to try this issue as my first challenge. Do I have to wait till this issue is assigned to me before working on it, or could I just go ahead and check it out?

[kevinlu1248]

@codyebberson How do you feel about handing this off to Sweep?