fix: toLowerCase is not a function

[Zyles]

Description

Can't transform values anymore.

"class-transformer": "^0.5.1"

Minimal code-snippet showcasing the problem

@Transform(({ value }) => value.toLowerCase())

Expected behavior

Transform value to lowercase.

Actual behavior

Error:
TypeError: value.toLowerCase is not a function

[Zyles]

Nevermind. My app recasted it to integer and my @IsString did not pick up on it.

[github-actions]

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