don't replace spaces with periods in data frame conversion #385

Job	Run time
build_rlang_kernels (4.3.0)	1h 4m 35s
base-linting	2m 33s
build_python_kernels (3.9, base)	3m 35s
Run pre-commit hooks	32s
build_python_kernels (3.9, base-gpu)	9m 56s
build_python_kernels (3.10, base)	3m 28s
build_deno_kernels (1.37)	2m 30s
create_release	0s
build_rust_kernels (1.70.0)	8m 20s
build_python_kernels (3.10, base-gpu)	9m 46s
	1h 45m 15s

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