a1cc621e1e
`CD_HAIRLENGTH` is not really a custom data type, it was just used to specify the hair particle "length" attribute to pass it to EEVEE and material preview. Because of the "typemap" array in `CustomData`, it's better not to have this unnecessary type. Instead, use the same mechanism used to request the active color attribute. Pull Request: https://projects.blender.org/blender/blender/pulls/109449
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