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A type T is Formattable if it can be passed as a format
argument to SQL formatting functions, like format_sql
or format_context_base::append_value.
Formally, a type T satisfies
Formattable if any of the
following are true:
WritableField.
This includes scalar types and optionals.
identifier.
formatter
has been specialized for T.
For a reference table on built-in formattable types, see this section.