Add quoted.Liftable[BigInt] to the stdlib

Author: nicolasstucki

library/src/scala/quoted/Liftable.scala

@@ -240,4 +240,13 @@ object Liftable {
     }
   }
 
+  /** Lift a BigDecimal using the default MathContext */
+  given as Liftable[BigDecimal] = new Liftable[BigDecimal] {
+    def toExpr(x: BigDecimal): given QuoteContext => Expr[BigDecimal] = {
+      lazy val xInt: Int = x.intValue()
+      if (x.isValidInt && -512 <= xInt && xInt < 512) '{ BigDecimal(${xInt.toExpr}) } // Cached BigDecimal
+      else '{ BigDecimal(${x.toString.toExpr}) }
+    }
+  }
+
 }

tests/run-with-compiler/quote-lift-BigDecimal.check

@@ -0,0 +1 @@
+(2.3,1005849025843905834908593485984390583429058574925.95489543)

tests/run-with-compiler/quote-lift-BigDecimal.scala

@@ -0,0 +1,9 @@
+import scala.quoted._
+object Test {
+  implicit val toolbox: scala.quoted.Toolbox = scala.quoted.Toolbox.make(getClass.getClassLoader)
+  def main(args: Array[String]): Unit = println(run {
+    val a = BigDecimal(2.3).toExpr
+    val b = BigDecimal("1005849025843905834908593485984390583429058574925.95489543").toExpr
+    '{ ($a, $b) }
+  })
+}