avoid transmuting Box when we can just cast raw pointers instead

[RalfJung]

Always better to avoid a transmute, in particular when the layout assumptions it is making are not clearly documented. :)

[rustbot]

r? @m-ou-se

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[m-ou-se]

@bors r+

[bors]

📌 Commit f2172ea has been approved by m-ou-se

It is now in the queue for this repository.

[bors]

⌛ Testing commit f2172ea with merge bd138e2...

[bors]

☀️ Test successful - checks-actions
Approved by: m-ou-se
Pushing bd138e2 to master...

[rust-timer]

Finished benchmarking commit (bd138e2): 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

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)	2.0%	[2.0%, 2.0%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-3.2%	[-3.2%, -3.2%]	1
Improvements ✅ (secondary)	-4.0%	[-4.0%, -4.0%]	2
All ❌✅ (primary)	-0.6%	[-3.2%, 2.0%]	2

Cycles

Results

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)	0.7%	[0.7%, 0.7%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.7%	[-2.7%, -2.7%]	1
All ❌✅ (primary)	0.7%	[0.7%, 0.7%]	1

Binary size

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

Bootstrap: 634.954s -> 632.38s (-0.41%)
Artifact size: 347.10 MiB -> 347.07 MiB (-0.01%)