(1)  The docs suggest that normal indices are optional.  I just took a
working mesh, added *only* a normal_vectors section, and got an error
message about missing  normal_indices.

(2)  IMHO,  you should build a complete, non-optimized mesh with all its
components (i.e.,  normal_indices)  before optimizing it.   The way it's
done in the docs leaves me totally confused as to what a normal_indices  is.

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