api: more robust processing of custom weight with spacing #7171

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	51m 41s
pytest-ubuntu-py311-gcc11-noomp-adjoint	39m 12s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 47s
pytest-ubuntu-py312-gcc12-omp-adjoint	48m 18s
pytest-ubuntu-py39-gcc7-omp-base	52m 46s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 9s
pytest-ubuntu-py310-gcc10-noomp-base	50m 54s
pytest-ubuntu-py310-gcc10-noomp-adjoint	39m 42s
pytest-ubuntu-py312-gcc13-omp-base	1h 8m 28s
pytest-ubuntu-py312-gcc13-omp-adjoint	50m 43s
pytest-ubuntu-py39-gcc9-omp-base	54m 12s
pytest-ubuntu-py39-gcc9-omp-adjoint	40m 2s
pytest-osx-py312-clang-omp-base	37m 27s
pytest-docker-py39-gcc-omp-base	46m 42s
pytest-docker-py39-gcc-omp-adjoint	37m 18s
pytest-docker-py39-icx-omp-base	37m 50s
pytest-docker-py39-icx-omp-adjoint	35m 4s
	13h 18m 15s

Provide feedback