rlp.read for openarrays

rlp.nim

@@ -276,6 +276,8 @@ proc read*(rlp: var Rlp, T: typedesc[enum]): T =
   rlp.skipElem
 
 proc read*[R, E](rlp: var Rlp, T: type array[R, E]): T =
+  mixin read
+
   when E is byte:
     if not rlp.isBlob:
       raise newException(BadCastError, "The source RLP is not a blob.")
@@ -297,7 +299,9 @@ proc read*[R, E](rlp: var Rlp, T: type array[R, E]): T =
       result[i] = rlp.read(E)
       inc i
 
-proc read*[E](rlp: var Rlp, T: typedesc[seq[E]]): T =
+proc read*[E](rlp: var Rlp, T: type seq[E]): T =
+  mixin read
+
   when E is byte:
     var bytes = rlp.toBytes
     result = newSeq[byte](bytes.len)
@@ -311,6 +315,9 @@ proc read*[E](rlp: var Rlp, T: typedesc[seq[E]]): T =
     for elem in rlp:
       result.add rlp.read(E)
 
+proc read*[E](rlp: var Rlp, T: type openarray[E]): seq[E] =
+  result = read(rlp, seq[E])
+
 proc read*(rlp: var Rlp, T: typedesc[object|tuple],
            wrappedInList = wrapObjectsInList): T =
   mixin enumerateRlpFields, read

rlp/writer.nim

@@ -172,6 +172,8 @@ template append*(self; e: enum) =
   append(self, int(e))
 
 proc append*[T](self; listOrBlob: openarray[T]) =
+  mixin append
+
   # TODO: This append proc should be overloaded by `openarray[byte]` after
   # nim bug #7416 is fixed.
   when T is byte:
@@ -182,6 +184,8 @@ proc append*[T](self; listOrBlob: openarray[T]) =
       self.append listOrBlob[i]
 
 proc append*[T](self; list: seq[T]) =
+  mixin append
+
   self.startList list.len
   for i in 0 ..< list.len:
     self.append list[i]