Request for information: Implementation-specific DEFPACKAGE extensions

[Robert Goldman]

@gefjon has proposed ASDF MR [!226](https://gitlab.common-lisp.net/asdf/asdf/-/merge_requests/226) that extends ASDF's package inferred system dependency groveler to handle SBCL's extension to the set of `defpackage` options, addressing [Issue #147](https://gitlab.common-lisp.net/asdf/asdf/-/issues/147).

Thanks,
R

Before merging this, it would be nice to know of other implementations' extensions to `defpackage`. I'd be obliged if those in the know would post information about `defpackage` extensions their favored implementations have added, if any, or let us know if tfi leaves `defpackage` un-extended. That would make it quicker to get this fix merged and issued, and would help the community as a whole. Feel free to respond by email, or to post your answer in the comments to the merge request, whichever is most convenient.

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