fix: strictly numerical arrays were truncated

[LuLaValva]

Description

This code:

$ const arr = [1, 2, 3];

formatted to this:

$ const arr = [3];

The primary cause of this is that Prettier's printDocToString has side effects that we didn't expect, so we need to give it an individual copy of docs.

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (1352984) 92.47% compared to head (3d5357c) 92.53%.

❗ Current head 3d5357c differs from pull request most recent head cb5066a. Consider uploading reports for the commit cb5066a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   92.47%   92.53%   +0.06%     
==========================================
  Files          11       11              
  Lines         372      375       +3     
  Branches      113      113              
==========================================
+ Hits          344      347       +3     
  Misses         13       13              
  Partials       15       15              

Impacted Files	Coverage Δ
src/index.ts	90.24% <100.00%> (+0.12%)	⬆️
src/utils/with-block-if-needed.ts	100.00% <100.00%> (ø)
src/utils/with-parens-if-needed.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 1.2.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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