[media-types] Proposal for "script" top-level Media Type

[Aaron Franke <[e-mail]>]

Hello IETF,
https://www.iana.org/assignments/media-types/media-types.xhtml
IETF / IANA currently defines several top-level media types: application, audio, font, example, image, message, model, multipart, text, video, and the proposed haptics.

However, there is a major category missing: script. Currently scripts are split across the application and text top-level types.* Many scripts are text-based, but also many are not (such as visual scripting languages like Scratch or Unreal Blueprints), so not all scripts fit under the text type. Since "application/javascript" has been deprecated in favor of "text/javascript", this suggests that IETF / IANA wants to standardize scripts under "text", but this is not suitable for all types of scripts.
* Scripts make sense under "application", but that is very broad, while "script" would be much more descriptive. Scripts are unique in that they are intended to be executed somehow, they are not just blobs of application-specific data.
I propose adding a new "script" top-level Media Type. This may cause confusion in the short term since existing types would still be under "application" or "text", but in the long run it will be much more organized.* Note that most scripting and programming languages do not currently have Media Types registered with IETF / IANA, so now is the perfect time to standardize a "script" top-level type. While JavaScript and PostScript have registered Media Types, other languages like Python, Lua, Perl, PHP, C#, C++, Rust, shell scripts, and more do not. It would be great to register "script/python", "script/lua", etc as the Media Types for these formats.
* Should it exist, I would like to use "script" as the top-level Media Type for the visual scripting language being developed at The Mirror (the company I work at), and I would also like to use it for the GDScript programming language in Godot which currently does not have a registered Media Type (proposed value: "script/gdscript").

As far as I know, the process for submitting top-level media types has not yet been formalized, so I am writing this email as a proposal. I originally sent this to IANA and was told by Amanda Baber to contact the mediaman group about this. I have also read though draft-ietf-mediaman-toplevel-03, I do not know how to create a Standards Track RFC but I believe this meets the criteria laid out in the draft, the set of types that can be included under the proposed script type is very large and very straightforward (it's either a script in a programming language, or it's not), security is not a concern because JavaScript is already an example of a scripting language with a media type which shows distributing arbitrary scripts is a secure, valid, common, and desired use case, I as the proposer am able to implement this type in my applications, and it helps human understanding of the types. It does fail the negative criteria of "SHOULD NOT generate aliases for existing widely used types or subtypes" iff JavaScript is desired to be "script/javascript", however that is optional (we can keep it as "text/javascript" if desired). Also I see that this "must be done via standards-track RFC; no other mechanism can be used", so I would appreciate help with creating such an RFC.

Thank you for your consideration,

Aaron Franke
The Mirror Megaverse Inc & Godot Engine