support long else...if blocks?

[spaghetti-squash]

This essentially lets us continue to honor the contract of if_ as it previously existed and as it existed in the first else work. But we don't need to honor the latter, because it hasn't been released.

I don't love that the frontmost elements don't need to be an object but subsequent entries do. Maybe it makes sense to keep if_ as it once was, and do ifElse that accepts just an ElseTrain argument?

[Ignose]

I'm not sure where size limits for macros are housed (maybe Libram lets the user put this particular gun to this foot) but otherwise this looks good.

[spaghetti-squash]

I'm not sure where size limits for macros are housed (maybe Libram lets the user put this particular gun to this foot) but otherwise this looks good.

Libram doesn't track size limits, macros are remarkably stateless. Like, all they contain is an array of bare strings for their steps.

We could adjust the Type of the ElseTrain to be

export type ElseTrain =
  [...Tuple<ElseIfComponent, Range<0, 69>>] | [...Tuple<ElseIfComponent, Range<0, 68>>, string | Macro | undefined]