chore: single integral type

[michaeljklein]

Description

Problem*

Resolves #6798

Summary*

Additional Context

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

Peak Memory Sample

Program	Peak Memory	%
keccak256	74.51M	-6%
workspace	123.78M	0%
regression_4709	235.23M	-45%
ram_blowup_regression	74.55M	100%
private-kernel-tail	167.83M	-17%
private-kernel-reset	167.87M	-77%
private-kernel-inner	167.84M	-43%
parity-root	151.57M	-12%

[github-actions]

Execution Memory Report

Program	Peak Memory	%
keccak256	74.55M	0%
workspace	123.69M	0%
regression_4709	316.60M	0%
ram_blowup_regression	74.59M	-86%
rollup-base-public	208.58M	-57%
rollup-base-private	207.23M	-37%
private-kernel-tail	176.35M	-3%
private-kernel-reset	176.95M	-30%
private-kernel-inner	179.39M	-15%

[github-actions]

Compilation Memory Report

Program	Peak Memory	%
keccak256	74.55M	-6%
workspace	123.78M	0%
regression_4709	316.60M	-26%
ram_blowup_regression	74.59M	100%
rollup-base-public	208.58M	100%
rollup-base-private	207.23M	100%
private-kernel-tail	176.35M	-15%
private-kernel-reset	176.95M	-76%
private-kernel-inner	179.39M	-40%