respect attribute default value as a block

[Sen-Zhang]

A propositional fix to issue #24249

[rails-bot]

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[maclover7]

Hmm, this seems like more of a feature request than a bug report...

[Sen-Zhang]

Oops, should I close this pull request for now?

[rafaelfranca]

r? @sgrif

[sgrif]

I'm not a fan of this implementation. The solution is too far removed from the problem. I'd prefer to keep the handling of procs isolated to the area where it already occurs.

[Sen-Zhang]

The new fix #24306 is just for tag helpers.