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A type T is a WritableFieldTuple if it's a std::tuple
specialization, or a reference to one, and all element types fulfill the
exposition-only concept WritableField.
Empty tuples satisfy WritableFieldTuple.
A type is a WritableField
if it can be used to represent a statement parameter value to be sent to
the server. A type T satisfies
WritableField if it is any of the types
listed in this table, or a (possibly cv-qualified) reference to any
of them. More types may be added in future releases.