why each erlang process sets 233 words as its default heap size?

Hi all,
      My first instinction is that it want to club together with one process size  to reach exactly 1024 bytes . But each process has more than 1024/4 -233 = 23 words size .
      What's the author's original intention? why each erlang process  sets 233 words as  its default heap size?

Thx,
Jeremy


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