A tuple is a fixed-size, ordered array whose elements may have different types or shapes. Unlike a homogeneous array, each position has its own schema. section 12.1
Function arguments as a tuple
Represent the arguments to Catalog.searchBooksByTitle as a two-element tuple: the first element is catalog data and the second is a string query. Validate the tuple at development time, after boundary validation has already protected production inputs. section 12.1
