start an ArrayVec extension trait

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/arrayvec.rs

@@ -0,0 +1,15 @@
+use ::arrayvec::ArrayVec;
+
+pub trait ArrayVecExt<T> {
+	fn extend_from_slice(&mut self, other: &[T]) -> &mut Self;
+}
+
+impl<T: Copy, const CAP: usize> ArrayVecExt<T> for ArrayVec<T, CAP> {
+	#[inline]
+	fn extend_from_slice(&mut self, other: &[T]) -> &mut Self {
+		self.try_extend_from_slice(other)
+			.expect("Insufficient buffer capacity to extend from slice");
+
+		self
+	}
+}