feat!: make mcstack immutable to avoid surprises #57
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mcstack
was mutable, meaning that you had to always save a copy of it in order to get the right marked contents for aContentObject
outside of iteration context. This was particularly problematic for PAVÉS' pdfminer.six emulation.Turns out there isn't really any extra cost in making it a tuple, as it doesn't change very often, so (breaking change...) we do this here.