Rerouted (retagged, verified). The tag now points at a different commit than when this version was published. The Lamdera package server serves a copy recovered from https://github.com/noahzgordon/elm-jsonapi.
What we checked: Tag 3.0.0 now points at f2309b1f0284, not the published commit. Rebuilt with git archive from commit 4b26872c7c76 of https://github.com/noahzgordon/elm-jsonapi (zip prefix noahzgordon-elm-jsonapi-4b26872/, America/Los_Angeles times): the zip is byte-identical to the one package.elm-lang.org recorded, SHA-1 2bca32d696641706fa06d77402d2cc267ea40420.
The Lamdera compiler uses this copy and prints a one-line notice saying so. elm itself fails to download this version.
Details · package.elm-lang.org's zip: https://github.com/noahzgordon/elm-jsonapi/zipball/3.0.0/
Functions for encoding JSON API resources to Json
Encode a resource constructed on the client to a JSON API-compliant value see: http://jsonapi.org/format/#crud-creating