Some functions in SlydifiOverlay have counterintuitive names

[na4zagin3]

The current version has the following conditional functions.
IMO some of them should be renamed.

Name	Behavior	Proposal
only n	n-layer == n	keep
elsewhen n	not (only n)	can we replace this with negate : ('a -> bool) -> 'a -> bool
till n	n-layer <= n	it's a matter of taste, but why not rename to until to align with Beamer which has \untilSlide
after n	n-layer >= n	rename to from because “after” is non-inclusive (n-layer > n)
during m n	(n-layer >= m) && (n-layer <= n)	rename for between because it's more typical.
in-case nlst	nlst includes the current layer number n-layer	rename for on-slides

[monaqa]

Thank you so much for your suggestion!
We have included the changes you mentioned in the v0.4.0 release.