changeType in CommitRef have bad type

In most cases changeType have only one value eg. edit or rename.
But there are cases we can souch value in response:

Current:

"changeType": "edit, rename",

Please change value type on change type from string to array of string.

Expected:

"changeType": ["edit", "rename"]

Start by locating the CommitRef definition and its changeType field in the API specifications. Review how the current string value is declared, then update the type so multiple values are represented as an array of strings. Confirm the resulting response matches ["edit", "rename"].

Written by the indexing model from the issue text.