Argument validation

looks ugly and is repetitive but works fairly well
the main thing to catch is that the provided values are of correct type (scalar/object/list), without any validation it is possible to pass an object instead of e.g. file_id which leads to very strange errors
there is slight twist in files, where id can be either a string or integer - it should be treated as string (to avoid int overflow), but the JSON response contains it as an integer

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