Khan / perseus / 5360300469

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Round 2 of small type improvements (#582)

## Summary:

A few more type fixes.

Issue: "none"

## Test plan:

✅ `yarn; yarn tsc` 
✅ `yarn test`

Author: jeremywiebe

Reviewers: jeremywiebe, nedredmond, handeyeco, SonicScrewdriver, eamspoker

Required Reviewers:

Approved By: handeyeco

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/582

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