I am working on a stored procedure that returns metadata from SQL Server Object views.
And, though it will reside in the master database it needs to contextually run against the targeted database.
Unfortunately, the SQL Instance I am trying to deploy it against is a case-sensitive database and so everything has to be in its proper case.
Unfortunately, undocumented objects are not exposed in system catalog views and so there is no way to verify the actual case.
Trial & Error
Through trial and error, found it to be
exec [dbo].[sp_MS_marksystemobject] [object-name] go
exec [dbo].[sp_MS_marksystemobject] '[dbo].[sp_IndexIdentifyDuplicatesIgnoreIncludedColumns]' go