Re: unset "hash[key]" isn't matched with what "key" may be

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Feb 7, 11:05pm, Bart Schaefer wrote:
}
} This does reflect a change from previous behavior, so we'll want to
} consider it carefully.

Since no one commented to the contrary, I've pushed this so we can get
some additional experience with it.