More `Liftable` instances are needed.

[odersky]

So far, we only have instances for primitive types and String. This is not enough. We should have at the very least instances for

• Bigint, BigDecimal
• all kinds of arrays
• Seq, Set, Map

[nicolasstucki]

• Arrays
  • Array (Add quoted.Liftable[BigInt] and quoted.Liftable[BigDecimal] to the stdlib #6944)
  • IArray (Add scala.quoted.Liftables to the stdlib #6928)
• Collections
  • immutable.Set (hashset only?) (Add scala.quoted.Liftables to the stdlib #6928)
  • immutable.Seq (Add scala.quoted.Liftables to the stdlib #6928)
  • immutable.List (Add scala.quoted.Liftables to the stdlib #6928)
  • immutable.Map (hashmap only?) (Add scala.quoted.Liftables to the stdlib #6928)
• Numeric
  • Primitives
  • BigInt (Add quoted.Liftable[BigInt] and quoted.Liftable[BigDecimal] to the stdlib #6944)
  • BigDecimal (Add quoted.Liftable[BigInt] and quoted.Liftable[BigDecimal] to the stdlib #6944)
• Other
  • java.lang.String
  • java.lang.Class
  • Option (Add scala.quoted.Liftables to the stdlib #6928)
  • util.Either (Add scala.quoted.Liftables to the stdlib #6928)
  • reflect.ClassTag (Specialize liftable for Arrays and IArrays #6945)
  • TupleN for 0 < N <= 22 (Add scala.quoted.Liftables to the stdlib #6928)
  • TupleN for N > 22 (Add quoted.Liftable[TupleN] with N > 22 to the stdlib #6947)