Merge glb and lub modules

[nnethercote]

Tons of code is duplicated across them, and it's easy to factor that out.

r? @lcnr

[rustbot]

changes to the core type system

cc @compiler-errors, @lcnr

[lcnr]

this change itself is positive, even if my medium-term goal is to remove these relations entirely.

[nnethercote]

I have addressed the comments and fixed the rustdoc error. Thanks!

[lcnr]

r=me after nits

[nnethercote]

I addressed the latest comments.

@bors r=lcnr

[bors]

📌 Commit ee227de has been approved by lcnr

It is now in the queue for this repository.

[bors]

⌛ Testing commit ee227de with merge 7067e4a...

[bors]

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 7067e4a to master...

[rust-timer]

Finished benchmarking commit (7067e4a): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (secondary 0.1%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.9%	[3.6%, 4.3%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.4%	[-2.6%, -2.2%]	3
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 2.5%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.5%	[1.9%, 3.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 774.169s -> 772.19s (-0.26%)
Artifact size: 342.02 MiB -> 342.02 MiB (-0.00%)