bug#69533: 30.0.50; Wrong byte compilation of a certain apply syntax

[Mattias Engdegård]

This was probably just a mistake of mine; a `<=` should have been `<`. Sorry 
about that, I'll fix.

I think Stefan introduced the 1-arg `apply` semantics as a principled and 
natural extension to the 2-or-more-arg case, but I'm less convinced. In any 
case, it's there and documented.

However it is tempting to see the spotty implementation and bugs in many 
versions as the converse of Hyrum's law that lets us remove the feature 
instead...