Port scopts to explicit nulls

scopt.diff

diff --git a/jvm/src/main/scala/PlatformReadInstances.scala b/jvm/src/main/scala/PlatformReadInstances.scala
index da707c4..73227a7 100644
--- a/jvm/src/main/scala/PlatformReadInstances.scala
+++ b/jvm/src/main/scala/PlatformReadInstances.scala
@@ -12,7 +12,7 @@ private[scopt] object platform {
   import java.net.{ InetAddress, URI }
 
   type ParseException = java.text.ParseException
-  def mkParseEx(s: String, p: Int) = new java.text.ParseException(s, p)
+  def mkParseEx(s: String | Null, p: Int) = new java.text.ParseException(s, p)
 
   trait PlatformReadInstances {
     def calendarRead(pattern: String): Read[Calendar] = calendarRead(pattern, Locale.getDefault)
diff --git a/shared/src/main/scala/scopt/Read.scala b/shared/src/main/scala/scopt/Read.scala
index 186580d..94725d7 100644
--- a/shared/src/main/scala/scopt/Read.scala
+++ b/shared/src/main/scala/scopt/Read.scala
@@ -97,25 +97,25 @@ object Read extends platform.PlatformReadInstances {
 
   // reads("1,2,3,4,5") == Seq(1,2,3,4,5)
   implicit def seqRead[A: Read]: Read[CSeq[A]] = reads { (s: String) =>
-    s.split(sep).toList.map(implicitly[Read[A]].reads)
+    s.split(sep).toList.map(x => implicitly[Read[A]].reads(x.nn))
   }
   // reads("1,2,3,4,5") == List(1,2,3,4,5)
   implicit def immutableSeqRead[A: Read]: Read[ISeq[A]] = reads { (s: String) =>
-    s.split(sep).toList.map(implicitly[Read[A]].reads)
+    s.split(sep).toList.map(x => implicitly[Read[A]].reads(x.nn))
   }
 
   // reads("1=false,2=true") == Map(1 -> false, 2 -> true)
   implicit def mapRead[K: Read, V: Read]: Read[Map[K, V]] = reads { (s: String) =>
-    s.split(sep).map(implicitly[Read[(K, V)]].reads).toMap
+    s.split(sep).map(x => implicitly[Read[(K, V)]].reads(x.nn)).toMap
   }
 
   // reads("1=false,1=true") == List((1 -> false), (1 -> true))
   implicit def seqTupleRead[K: Read, V: Read]: Read[CSeq[(K, V)]] = reads { (s: String) =>
-    s.split(sep).map(implicitly[Read[(K, V)]].reads).toList
+    s.split(sep).map(x => implicitly[Read[(K, V)]].reads(x.nn)).toList
   }
   // reads("1=false,1=true") == List((1 -> false), (1 -> true))
   implicit def immutableSeqTupleRead[K: Read, V: Read]: Read[ISeq[(K, V)]] = reads { (s: String) =>
-    s.split(sep).map(implicitly[Read[(K, V)]].reads).toList
+    s.split(sep).map(x => implicitly[Read[(K, V)]].reads(x.nn)).toList
   }
 
   implicit def optionRead[A: Read]: Read[Option[A]] = reads {