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+type asker
+
+val anonymous : asker
+val namedAsker : string -> asker
+
+
+(********************************* Instances *********************************)
+
+val eq_asker : eq asker
+
+val show_asker : show asker
+
+(* 'read' producing an 'asker' is guaranteed to never fail, so you can use
+'readError' with impunity. *)
+val read_asker : read asker
+
+val sql_asker : sql_injectable asker