--- libmalloc/libmalloc-657.60.21/src/pgm_malloc.c
+++ libmalloc/libmalloc-646.0.13/src/pgm_malloc.c
@@ -582,13 +582,6 @@
 }
 
 static void *
-pgm_malloc_type_malloc(pgm_zone_t *zone, size_t size, malloc_type_id_t type_id)
-{
-	SAMPLED_ALLOCATE(size, k_min_alignment, malloc_type_malloc, size, type_id);
-	return ptr;
-}
-
-static void *
 pgm_calloc(pgm_zone_t *zone, size_t num_items, size_t size)
 {
 	size_t total_size;
@@ -596,21 +589,7 @@
 		return DELEGATE(calloc, num_items, size);
 	}
 	SAMPLED_ALLOCATE(total_size, k_min_alignment, calloc, num_items, size);
-	bzero(ptr, total_size);
-	return ptr;
-}
-
-static void *
-pgm_malloc_type_calloc(pgm_zone_t *zone, size_t num_items, size_t size,
-		malloc_type_id_t type_id)
-{
-	size_t total_size;
-	if (os_unlikely(os_mul_overflow(num_items, size, &total_size))) {
-		return DELEGATE(malloc_type_calloc, num_items, size, type_id);
-	}
-	SAMPLED_ALLOCATE(total_size, k_min_alignment, malloc_type_calloc, num_items,
-			size, type_id);
-	bzero(ptr, total_size);
+	memset(ptr, 0, total_size);
 	return ptr;
 }
 
@@ -643,23 +622,6 @@
 	return new_ptr;
 }
 
-static void *
-pgm_malloc_type_realloc(pgm_zone_t *zone, void *ptr, size_t new_size,
-		malloc_type_id_t type_id)
-{
-	if (os_unlikely(!ptr)) {
-		return pgm_malloc_type_malloc(zone, new_size, type_id);
-	}
-	boolean_t sample = should_sample(zone, new_size);
-	if (os_likely(!sample)) {
-		DELEGATE_UNGUARDED(ptr, malloc_type_realloc, ptr, new_size, type_id);
-	}
-	lock(zone);
-	void *new_ptr = (void *)reallocate(zone, (vm_address_t)ptr, new_size, sample);
-	unlock(zone);
-	return new_ptr;
-}
-
 static void my_vm_deallocate(vm_address_t addr, size_t size);
 static void
 pgm_destroy(pgm_zone_t *zone)
@@ -672,7 +634,8 @@
 static void *
 pgm_memalign(pgm_zone_t *zone, size_t alignment, size_t size)
 {
-	if (os_unlikely(alignment > PAGE_SIZE)) {
+	// Delegate for (alignment > page size) and invalid alignment sizes.
+	if (alignment > PAGE_SIZE || !is_power_of_2(alignment) || alignment < sizeof(void *)) {
 		return DELEGATE(memalign, alignment, size);
 	}
 	size_t adj_alignment = MAX(alignment, k_min_alignment);
@@ -680,19 +643,6 @@
 	return ptr;
 }
 
-static void *
-pgm_malloc_type_memalign(pgm_zone_t *zone, size_t alignment, size_t size,
-		malloc_type_id_t type_id)
-{
-	if (os_unlikely(alignment > PAGE_SIZE)) {
-		return DELEGATE(malloc_type_memalign, alignment, size, type_id);
-	}
-	size_t adj_alignment = MAX(alignment, k_min_alignment);
-	SAMPLED_ALLOCATE(size, adj_alignment, malloc_type_memalign, alignment, size,
-			type_id);
-	return ptr;
-}
-
 static void
 pgm_free_definite_size(pgm_zone_t *zone, void *ptr, size_t size)
 {
@@ -710,32 +660,35 @@
 pgm_malloc_with_options(pgm_zone_t *zone, size_t align, size_t size,
 		uint64_t options)
 {
-	if (os_unlikely(align > PAGE_SIZE)) {
+	if (os_unlikely(should_sample(zone, size))) {
+		size_t adj_alignment = MAX(align, k_min_alignment);
+		lock(zone);
+		void *ptr = (void *)allocate(zone, size, adj_alignment);
+		unlock(zone);
+		if (ptr) {
+			if (options & MALLOC_NP_OPTION_CLEAR) {
+				bzero(ptr, size);
+			}
+			return ptr;
+		}
+		// If the allocation fails, fall back to the wrapped zone
+	}
+
+	// FIXME: calls wrapped_zone->malloc_with_options/memalign without NULL check
+	if (zone->wrapped_zone->version >= 15 &&
+			zone->wrapped_zone->malloc_with_options) {
 		return DELEGATE(malloc_with_options, align, size, options);
-	}
-	size_t adj_alignment = MAX(align, k_min_alignment);
-	SAMPLED_ALLOCATE(size, adj_alignment, malloc_with_options, align, size, options);
-	if (options & MALLOC_NP_OPTION_CLEAR) {
-		bzero(ptr, size);
-	}
-	return ptr;
-}
-
-static void *
-pgm_malloc_type_malloc_with_options(pgm_zone_t *zone, size_t align, size_t size,
-		uint64_t options, malloc_type_id_t type_id)
-{
-	if (os_unlikely(align > PAGE_SIZE)) {
-		return DELEGATE(malloc_type_malloc_with_options, align, size, options,
-				type_id);
-	}
-	size_t adj_alignment = MAX(align, k_min_alignment);
-	SAMPLED_ALLOCATE(size, adj_alignment, malloc_type_malloc_with_options,
-			align, size, options, type_id);
-	if (options & MALLOC_NP_OPTION_CLEAR) {
-		bzero(ptr, size);
-	}
-	return ptr;
+	} else if (align) {
+		void *ptr = DELEGATE(memalign, align, size);
+		if (ptr && (options & MALLOC_NP_OPTION_CLEAR)) {
+			bzero(ptr, size);
+		}
+		return ptr;
+	} else if (options & MALLOC_NP_OPTION_CLEAR) {
+		return DELEGATE(calloc, 1, size);
+	} else {
+		return DELEGATE(malloc, size);
+	}
 }
 
 #pragma mark -
@@ -1030,8 +983,7 @@
 #pragma mark -
 #pragma mark Zone Templates
 
-#define PGM_ZONE_VERSION 16
-#define MIN_WRAPPED_ZONE_VERSION 16
+#define PGM_ZONE_VERSION 15
 
 // Suppress warning: incompatible function pointer types
 #define FN_PTR(fn) (void *)(&fn)
@@ -1103,14 +1055,6 @@
 	.claimed_address = FN_PTR(pgm_claimed_address),
 	.try_free_default = NULL,
 	.malloc_with_options = FN_PTR(pgm_malloc_with_options),
-
-	// Typed entrypoints
-	.malloc_type_malloc = FN_PTR(pgm_malloc_type_malloc),
-	.malloc_type_calloc = FN_PTR(pgm_malloc_type_calloc),
-	.malloc_type_realloc = FN_PTR(pgm_malloc_type_realloc),
-	.malloc_type_memalign = FN_PTR(pgm_malloc_type_memalign),
-	.malloc_type_malloc_with_options =
-			FN_PTR(pgm_malloc_type_malloc_with_options),
 };
 
 
@@ -1306,18 +1250,9 @@
 disable_unsupported_apis(malloc_zone_t *pgm_zone, const malloc_zone_t *wrapped_zone)
 {
 	#define DISABLE_UNSUPPORTED(api) if (!wrapped_zone->api) pgm_zone->api = NULL;
-
-	// In practice, there are no zones we support wrapping right now that don't
-	// have these entrypoints
 	DISABLE_UNSUPPORTED(memalign)
-	DISABLE_UNSUPPORTED(malloc_type_memalign)
 	DISABLE_UNSUPPORTED(free_definite_size)
 	DISABLE_UNSUPPORTED(claimed_address)
-
-	// These ones are actually load-bearing: the nano and scalable zones do not
-	// implement these entrypoints
-	DISABLE_UNSUPPORTED(malloc_with_options)
-	DISABLE_UNSUPPORTED(malloc_type_malloc_with_options)
 }
 
 static void
@@ -1351,7 +1286,12 @@
 malloc_zone_t *
 pgm_create_zone(malloc_zone_t *wrapped_zone)
 {
-	MALLOC_ASSERT(wrapped_zone->version >= MIN_WRAPPED_ZONE_VERSION);
+	// The PGM zone includes the `malloc_introspection_t::zone_type` field
+	// (version 14) so we need to support the "malloc()/calloc() set errno to
+	// ENOMEM on failure" behavior (version 13).  Require wrapped zone to be at
+	// least version 13.
+	MALLOC_STATIC_ASSERT(PGM_ZONE_VERSION == 15, "PGM zone version");
+	MALLOC_ASSERT(wrapped_zone->version >= 13);
 
 	pgm_zone_t *zone = (pgm_zone_t *)my_vm_map(sizeof(pgm_zone_t), VM_PROT_READ_WRITE, VM_MEMORY_MALLOC);
 	setup_zone(zone, wrapped_zone);