diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6804d94826..260a503c88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 ## V 0.1.30
 *28 Nov 2020*
 (V 0.2 RC)
-- Builtin compile-time JSON serializer now supports `time.Time`
+- Builtin compile-time JSON serializer now supports `time.Time`.
+- `array.contains(element)` is now generic.
 TODO
 
 ## V 0.1.27
diff --git a/vlib/io/stream.v b/vlib/io/stream.v
deleted file mode 100644
index a1d8216ada..0000000000
--- a/vlib/io/stream.v
+++ /dev/null
@@ -1,52 +0,0 @@
-module io
-
-pub interface InputStream {
-	read_int() int
-	read_ints(l u32) []int
-	read_i8() i8
-	read_i8s(l u32) []i8
-	read_i16() i16
-	read_i16s(l u32) []i16
-	read_i64() i64
-	read_i64s(l u32) []i64
-	read_byte() byte
-	read_bytes(l u32) []byte
-	read_u16() u16
-	read_u16s(l u32) []u16
-	read_u32() u32
-	read_u32s(l u32) []u32
-	read_u64() u64
-	read_u64s(l u32) []u64
-	read_f32() f32
-	read_f32s(l u32) []f32
-	read_f64() f64
-	read_f64s(l u32) []f64
-	read_string(l u32)
-	skip(l u32)
-	read_struct(l u32) voidptr
-}
-
-pub interface OutputStream {
-	write_int(d int) ?
-	write_ints(d []int) ?
-	write_i8(d i8) ?
-	write_i8s(d []i8) ?
-	write_i16(d i16) ?
-	write_i16s(d []i16) ?
-	write_i64(d i64) ?
-	write_i64s(d []i64) ?
-	write_byte(d byte) ?
-	write_bytes(d []byte) ?
-	write_u16(d u16) ?
-	write_u16s(d []u16) ?
-	write_u32(d u32) ?
-	write_u32s(d []u32) ?
-	write_u64(d u64) ?
-	write_u64s(d []u64) ?
-	write_f32(d f32) ?
-	write_f32s(d []f32) ?
-	write_f64(d f64) ?
-	write_f64s(d []f64) ?
-	write_string(d string) ?
-	write_struct(d voidptr, l u32) ?
-}