standards/60663: POSIX.1-2024: dd(1) options

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>Number:         60663
>Category:       standards
>Synopsis:       POSIX.1-2024: dd(1) options
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    standards-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 28 16:50:00 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, ...
>Organization:
The FullBlockSD Foundation, Inc.
>Environment:
>Description:

	In POSIX.1-2024, dd(1) sprouted an iflags=fullblock, which --
	if I understood correctly after 6sec of reading and thinking
	-- when combined with bs=N is equivalent to our ibs=N obs=N
	in filling blocks of input before sending them to output,
	rather than sending partial blocks to outpu.

	We should also sync any other options with POSIX.

>How-To-Repeat:

	port openzfs test suite

>Fix:

	Yes, please!