Prefer explicit init in selectStar over bit-cast (#159)

* Prefer explicit init in `selectStar` over bit-cast

Fixes #139.

* fix

Author: stephencelis

Sources/StructuredQueriesCore/Statements/SelectStatement.swift

@@ -35,10 +35,11 @@ extension SelectStatement {
   /// Explicitly selects all columns and tables from this statement.
   ///
   /// - Returns: A select statement.
-  public func selectStar<each J: Table>() -> Select<
-    (From, repeat each J), From, (repeat each J)
-  > where Joins == (repeat each J) {
-    unsafeBitCast(asSelect(), to: Select<(From, repeat each J), From, (repeat each J)>.self)
+  public func selectStar<each J: Table>() -> Select<(From, repeat each J), From, (repeat each J)>
+  where Joins == (repeat each J) {
+    var select = Select<(From, repeat each J), From, (repeat each J)>()
+    select.clauses = asSelect().clauses
+    return select
   }
 }