feat: add `enforce_concatenated_form` #4037

Job	Run time
Build Python	19s
Build C++ x86	38s
Determine Pyodide Python version	8s
Build C++ WASM	34s
Execute cppyy notebook	1m 38s
Build Docs	4m 15s
Deploy	0s
Deploy Branch Preview	57s
	8m 29s

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