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# unknown device triggers error
`device` must be a string, function or `NULL`, not the number 1.
# invalid single-string DPI values throw an error
`dpi` must be one of "screen", "print", or "retina", not "abc".
# invalid non-single-string DPI values throw an error
`dpi` must be a single number or string, not a <factor> object.
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`dpi` must be a single number or string, not a character vector.
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`dpi` must be a single number or string, not a double vector.
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`dpi` must be a single number or string, not a list.
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