RHH: Use usize and u64 better
#486
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As reported in #479,
rhh.rstoo casually assumes thatusizehas 64 bits of representation. Chasing that down, we manipulate hashes, wired to beu64inconsistently and this PR means to fix the most obvious forms of that. The new code has the potential to error at runtime ifusizehas more bits thanu64, but I'm happy to make addressing that a problem for tomorrow.The RHH code is also pre-production, and mostly we want to avoid bad habits and unblock folks with 32 bit
usizeplatforms.cc: @oli-w