allocPtr

A convenience wrapper for allocChunks() which sizes each chunk as either 8 bytes (safePtrSize is truthy) or wasm.ptrSizeof (if safePtrSize is falsy).

How it returns its result differs depending on its first argument: if it's 1, it returns a single pointer value. If it's more than 1, it returns the same as allocChunks().

When any returned pointers will refer to a 64-bit value, e.g. a double or int64, and that value must be written or fetched, e.g. using wasm.poke() or wasm.peek(), it is important that the pointer in question be aligned to an 8-byte boundary or else it will not be fetched or written properly and will corrupt or read neighboring memory.

However, when all pointers involved point to "small" data, it is safe to pass a falsy value to save a tiny bit of memory.