Type Alias MapFromPairSliceFn 

pub type MapFromPairSliceFn = unsafe fn(map: PtrUninit, pairs_ptr: *mut u8, count: usize) -> PtrMut;

Build a map from a contiguous slice of (K, V) pairs.

This is an optimization for JIT deserialization that avoids per-entry vtable calls and rehashing by building the map with known capacity in one shot.

Safety

• map must point to uninitialized memory of sufficient size for the map.
• pairs_ptr must point to count contiguous (K, V) tuples, properly aligned.
• Keys and values are moved out via ptr::read - the memory should be deallocated but not dropped afterwards.