Schema Inaccuracy
The POST /user/repos endpoint does not list the property allow_update_branch in the request body, however it can be used to set this repository setting on creation.
The allow_update_branch request body property can be seen in the PATCH /repos/{owner}/{repo} endpoint.
Expected
The allow_update_branch property should be listed in the request body of POST /user/repos.
Reproduction Steps
Create two repositories and print the value of allow_update_branch of the created repositories:
$ gh api -X POST /user/repos -f name=test_allow_update_branch_1 -f allow_update_branch=true -q .allow_update_branch
true
$ gh api -X POST /user/repos -f name=test_allow_update_branch_2 -f allow_update_branch=false -q .allow_update_branch
false