chore: info & add internal warning

Author: peter-jerry-ye

builtin/builtin.mbti

@@ -308,6 +308,7 @@ fn[T] UninitializedArray::make(Int) -> Self[T]
 fn[T] UninitializedArray::op_as_view(Self[T], start~ : Int = .., end? : Int) -> ArrayView[T]
 fn[T] UninitializedArray::op_get(Self[T], Int) -> T
 fn[T] UninitializedArray::op_set(Self[T], Int, T) -> Unit
+fn[T] UninitializedArray::unsafe_blit(Self[T], Int, Self[T], Int, Int) -> Unit
 
 #deprecated
 fn Bool::op_compare(Bool, Bool) -> Int

builtin/uninitialized_array.mbt

@@ -98,6 +98,7 @@ pub fn[A] UninitializedArray::length(self : UninitializedArray[A]) -> Int {
 }
 
 ///|
+#internal(unsafe, "For internal use only.")
 pub fn[T] UninitializedArray::unsafe_blit(
   dst : UninitializedArray[T],
   dst_offset : Int,

deque/deque.mbti

@@ -22,10 +22,12 @@ fn[A] T::capacity(Self[A]) -> Int
 fn[A] T::clear(Self[A]) -> Unit
 fn[A : Eq] T::contains(Self[A], A) -> Bool
 fn[A] T::copy(Self[A]) -> Self[A]
+fn[A] T::drain(Self[A], start~ : Int, len? : Int) -> Self[A]
 fn[A] T::each(Self[A], (A) -> Unit) -> Unit
 fn[A] T::eachi(Self[A], (Int, A) -> Unit) -> Unit
 #deprecated
 fn[A] T::filter_map_inplace(Self[A], (A) -> A?) -> Unit
+fn[A] T::flatten(Self[Self[A]]) -> Self[A]
 fn[A] T::front(Self[A]) -> A?
 fn[A] T::is_empty(Self[A]) -> Bool
 fn[A] T::iter(Self[A]) -> Iter[A]