fix(#1894): make response of the metadata restricted to be raw text

[MSzalowski]

List of changes

• Make response of the metadata restricted to be raw text.
• Enforce format of the stringified metadata to match the resulting content on the pre-validation step.

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

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