optimizations

std.isbpl

@@ -280,9 +280,10 @@ func acopy {
     def arr2 =arr2
     def arr1 =arr1
 
-    def i 1 neg =i
-    while { ( i ++ =i ) ( i len lt ) } {
+    def i 0 =i
+    while { i len lt } {
         arr2 ( i idx2 + ) ( arr1 ( i idx1 + ) aget ) aput
+        i 1 + =i
     }
 
     arr2

stream.isbpl

@@ -23,18 +23,18 @@ func stream.readline {
     def id =id
     def byte 0 =byte
     def array 0 anew =array
-    def tmparray 0 anew =tmparray
     def i 1 neg =i
-    id STREAM.read stream =byte
-    byte -1 eq if {
-        -1
-        2 stop
-    }
-    while { ( i 1 + =i ) ( byte 10 eq not ) } {
-        array ( ( array alen 1 + anew ) dup =tmparray ) 0 0 ( array alen ) acopy =array
-        array dup alen 1 - byte _char aput
-        id STREAM.read stream =byte
-    }
+    [
+        id STREAM.read stream dup =byte _char
+        byte -1 eq if {
+            ] pop
+            -1
+            2 stop
+        }
+        while { ( i 1 + =i ) ( byte 10 eq not ) } {
+            id STREAM.read stream dup =byte _char 
+        }
+    ] =array
     array alen 0 eq if {
         array _string
         2 stop