That is interesting, thanks for that link. Is there a version history on the schema?
The ‘type’ property is definitely added by postman. I checked the file history on some of the collections that go back several years and the initial commits had those values included in all of the headers.
We just created a new collection using postman version 10.24.24 and it exported it - and the ‘type’ attribute is present:
We then imported that file using version 11.0.11 and re-exported it and it removed that property from each header:
FWIW we have been exporting with v2.1 for the past few years
https://schema.getpostman.com/json/collection/v2.1.0/collection.json
