File Type Validation does not check if extension and MIME Type match

[helphop]

I have tested the validation by changing the extension of a file. For example I took a file called 'test.pdf' and changed it to 'test.docx'. I validate as follows:

validates :file, presence: true, blob: { content_type: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'}

This passes. Shouldn't the validation fail since this is really a pdf and not a docx document?

[aki77]

This gem uses the activestorage content type guess as is.
The following may be helpful.
rails/rails#32833