fix: adjust discriminatedUnion.toString() to match function signature

[TheyCodeMeSilvers]

Fixes #549

Description

adjusts the discriminatedUnion syntax Issue: 549

Checklist —

• My PR's title follows the gitmoji specification
• My PR references any related issues
• Any new feature or breaking change must come with an associated Issue or Discussion
• Any added dependency must include an associated Issue or Discussion
• My PR adds relevant tests that they would have failed without my PR (when applicable)

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[ahrjarrett]

Looks good!

Will you do me a favor and run pnpm i && pnpm vitest and update the snapshots by pressing u in your terminal once the test fails?

Once that's done the CICD build should pass.

[TheyCodeMeSilvers]

Ah, sorry missed the snapshots, should be updated now

[pkg-pr-new]

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commit: c1aa2aa

[ahrjarrett]

LGTM