orm.pg: fix f32 and f64 endianness (#20412)

vlib/db/pg/orm.v

@@ -143,13 +143,15 @@ fn pg_stmt_match(mut types []u32, mut vals []&char, mut lens []int, mut formats
 		}
 		f32 {
 			types << u32(Oid.t_float4)
-			vals << &char(&data)
+			num := conv.htonf32(f32(data))
+			vals << &char(&num)
 			lens << int(sizeof(f32))
 			formats << 1
 		}
 		f64 {
 			types << u32(Oid.t_float8)
-			vals << &char(&data)
+			num := conv.htonf64(f64(data))
+			vals << &char(&num)
 			lens << int(sizeof(f64))
 			formats << 1
 		}

vlib/db/pg/pg_double_test.v

@@ -0,0 +1,39 @@
+module main
+
+import db.pg
+
+@[table: 'demo']
+struct Demo {
+	id      int @[primary; sql: serial]
+	number  f64
+	number2 f32
+}
+
+fn test_float_field() {
+	conn := 'host=localhost user=test password=test' // insert own connection string
+	db := pg.connect_with_conninfo(conn)!
+	defer {
+		db.close()
+	}
+
+	sql db {
+		create table Demo
+	}!
+
+	demo := Demo{0, 9.58815, 9.58815}
+	sql db {
+		insert demo into Demo
+	}!
+	rows := sql db {
+		select from Demo
+	}!
+
+	assert rows[0].number == 9.58815
+	assert rows[0].number2 == 9.58815
+
+	sql db {
+		drop table Demo
+	}!
+
+	println(rows)
+}