invalid propType when passing UTF8 bytes array to content prop

This is just a warning : `Warning: Failed prop type: Invalid prop `content` of type `object` supplied to `Download`, expected `string`. in Download`, the file is downloaded correctly.

It happens when content property is set to a UTF8 bytes array.

If I convert the byte array to a string, there is no warning but the file data is then incorrect (I am trying to download a PDF file).

Start at the Download component and inspect how its content prop is validated and consumed. Reproduce the warning with a UTF8 byte array and a PDF, then verify that the warning is gone while the downloaded PDF data remains correct.

Written by the indexing model from the issue text.