Invalid input: books/author/831
. Please provide a comma-separated list of id values, or a single id value. An id value is a positive whole number.
"This specification should be read like all other specifications. First, it should be read cover-to-cover, multiple times. Then, it should be read backwards at least once. Then it should be read by picking random sections from the contents list and following all the cross-references."
Invalid input: books/author/831
. Please provide a comma-separated list of id values, or a single id value. An id value is a positive whole number.