Caqti_template.Version
SourceOpaque version with comparison.
This version number module is intended for dispatching on details about an SQL intepreter or other relevant aspects of a relational database system. The only constructor is private, instead the Infix
module provides direct comparison to strings for ideomatic usage in the query-returning callback of request templates.
Note that a version can be undefined, in which case it will compare like the empty string.