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JonRC
8fb394ca16
`known` raised a typecheck for any key that can't be a key here (an array, a dictionary, a real with a fraction). The PLRM allows any object but null as a key, and since `put` refuses such keys, no dictionary holds one: `known` now answers false, and null still raises the typecheck. Ghostscript's eps2write prolog looks each inline-image value up in a dictionary of abbreviations, and an image with two filters has an array there.