Minor style change to naming of rule records: 'rule.json' to 'rule.ior+json'

Currently when creating a rule in RM, the extension is shown as ".rule.json".

Is there a reason the file name itself should not end with .rule.ior ? This would be distinguished from .lookup.ior

Also the RFC6839 specifies that an extension to indicate media type syntax would be with a '+' sign, like this: .rule.ior+json

Melnikov, A., & Hansen, T. (2013). RFC 6839. Additional Media Type Structured Syntax Suffixes. https://tools.ietf.org/html/rfc6839

Please advise if you reckon this approach would cause complications.