The NBT library included in MCPE can load TAG_Long values fine, but when saving, only 32 bits are saved, because the save method is declared as
CompoundTag::putLong(std::string const&, long)
when it should be declared as
CompoundTag::putLong(std::string const&, long long)
On ARM, long is a 32-bit integer, and long long is the 64 bit integer.
This affects world time and world seed, since as far as I know those values are the only values stored as longs.
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MCPE is the only version of Minecraft using 32bit, Java and 4J studios Console edition use 64bit. So it limits possibilites of world seeds
World seed is sent as a 32-bit Integer, and if I remember right, it was saved as a 32-bit number