There's two things I always wanted to know

1. Why wasn't realloc part of the spec? When I looked at wasm and emscripten it appeared that realloc was essentially malloc+memcpy? That'd be painful when arrays are bigger than L2 or L3 cache. I think I heard arm cpu's all standardized to have virtual memory in 2005 or 2010 so I don't think arm hardware was an issue?

2. It seems like 100% of system calls would have to be implemented through javascript? Why wasn't there some things wasm implemented itself like a way to get time or rdtsc, realloc and other very common operations?