replace uarray with Pod

sub/core/src/pod.rs

@@ -0,0 +1,20 @@
+use core::mem::MaybeUninit;
+
+/// Plain Old data type
+pub trait Pod: Copy + 'static {
+    fn uninit() -> Self { unsafe { MaybeUninit::uninit().assume_init() } }
+    fn zeroed() -> Self { unsafe { MaybeUninit::zeroed().assume_init() } }
+}
+
+macro_rules! primitive {
+    ($($p:ty),*) => {
+        $(impl Pod for $p {})*
+    }
+}
+
+primitive!(u8, u16, u32, u64, u128);
+primitive!(i8, i16, i32, i64, i128);
+primitive!(f32, f64, usize, isize);
+primitive!(());
+
+impl<const LEN: usize, T: Pod> Pod for [T;LEN] {}