Feature Request: Handling >2GB indexes

[lsarrazi]

First thanks for maintaining this very precious library which allow me not to depend on externals database to do geo intersections

Im currently using your library to build a 100M items index, Unfortunately Im restrained to using Float32Array since with a 64 bit array it would overflow the Uint8Array's used internally. ~3.8GB > 2GB
More to that,
My 32bit flatbush is currently 1.9GB, Im afraid if ever my dataset would grow, I'll reach the 2Gb+ and get the same error even with 32 Bit

Would it be possible to try to push the limit further ?