cue: Updating cue.All() to set the hasHidden flag to true

[lorrrrrrrenzo]

What version of CUE are you using (cue version)?

$ cue version

cue version v0.12.0

go version go1.23.5
      -buildmode exe
       -compiler gc
       -trimpath true
  DefaultGODEBUG asynctimerchan=1,gotypesalias=0,httpservecontentkeepheaders=1,tls3des=1,tlskyber=0,x509keypairleaf=0,x509negativeserial=1
     CGO_ENABLED 1
          GOARCH arm64
            GOOS darwin
         GOARM64 v8.0
cue.lang.version v0.12.0

Does this issue reproduce with the latest stable release?

Yes.

What did you do?

When comparing the behavior of cue.All() to other alternatives for configuring cue.Option in an attempt to reduce redundancy, I noticed that cue.All() might logically intend to include hidden fields and/or documentation, adopting the behavior of cue.Hidden(true) and cue.Docs(true) respectively. Using cue.All() almost exactly mimics the use of cue.Hidden(true), except the former does not set the hasHidden flag to true. We see something similar with cue.Docs(true), but I'm less sure that setting that flag, docs, is desirable behavior.

What did you expect to see?

For my use of cue.All() to not necessitate the use of cue.Hidden(true) as well.

What did you see instead?

The need to use cue.Hidden(true) as well.

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Happy to open a pull request.