/usr/lib/ocaml/camlimages/oPng.mli is in libcamlimages-ocaml-dev 1:4.2.0-1.1build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | val load_as_rgb24 : string -> Images.load_option list -> OImages.oimage
val load : string -> Images.load_option list -> OImages.oimage
val save : string -> Images.save_option list -> < image : Images.t; .. > -> unit
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