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Fix bug #1669735; FOREACH now throws a "not enough inputs" error when given fewer than two inputs.

Add a test that FOREACH is a macro, not a prodcedure (that is, that OUTPUT or STOP will run in the caller's context).

Test that macros that STOP or OUTPUT do so in the caller's context.

Fix some inconsistent capitalization for MY.REPEAT that I think was an unnecessary distraction from the content that was being presented.

Fix bug #1910177; WAIT now throws a bad input error when given input in the range <-1,0>, instead of doing nothing.

Add a regression test for bug #1910177; WAIT ignores input <-1,0> -- should throw bad input error

Fix bug #1599122; ZOOM now throws a bad input error when it inputs a non-positive value, instead of silently changing it to 1.

Rename pos_numeric_arg to nonnegative_numeric_arg to better reflect what it actually does. This was done because I need a real pos_numeric_arg to fix a bug in ZOOM and I didn't want to confuse the two functions.

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