You keep using that word `cast`. I do not think it means what you think it means 😀

[dhdaines]

pdfinterp.py is full of code like this:

    def do_G(self, gray: PDFStackT) -> None:
        """Set gray level for stroking operations"""
        self.graphicstate.scolor = cast(float, gray)
        self.scs = self.csmap["DeviceGray"]

It appears that the intent here (which would be logical to a Java programmer, for instance) is to ensure that the object in question is really a float, coercing it if possible, and throwing an exception if not.

Otherwise, various other code down the line will inevitably throw some other, possibly less obvious, exception. But also, it means that in the case where an object has a union type, e.g. Color:

Color = Union[
    float,  # Greyscale
    Tuple[float, float, float],  # R, G, B
    Tuple[float, float, float, float],  # C, M, Y, K
]

one could (except one cannot, see below) reliably check at runtime which of the possible values it is.

But that's not what typing.cast does! It is actually type assertion (like as in TypeScript) - it says to mypy, "I know this is a float so quit complaining that it isn't". It does nothing at runtime at all.

This is a longstanding issue for some users of pdfminer.six, for example: https://github.com/jsvine/pdfplumber/issues/917#issuecomment-1615259362

It also turns out to be the source of some fuzz errors, since invalid or corrupted PDFs can easily have objects of the wrong type, and instead of causing a PDFSyntaxError or PDFValueError this leads to some other exception which is not caught.

[dhdaines]

Note that Color of 4 values could also be RGBA, but that's beside the point ;-)

[KaboChow]

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