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GNAT (not Ada) has an implementation restriction that you cannot have multiple compilation-units in a single file; I believe that the dot-replacement is a holdover from when GNAT/GCC was dealing with DOS.
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I agree on the repetitions those need cleanup. Regarding filenames, it is a GNAT convention (the GCC's ada compiler) where we need to have the package name on it separated by -
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Ada has some excellent GENERICs, you can use them to great effect for reducing code-size.
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