Rewrite C ext to public C api #20
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BDIGIT api is internal ruby C api, and was removed from public api after
merge of Bignum and Fixnum into Integer.
Now use public C ruby api.
It is slower than previous BDIGIT api, but much faster than ruby version
user system total real
distance3_bdigit 0.198673 0.000000 0.198673 (0.198672)
distance3_public 0.373779 0.000000 0.373779 (0.373777)
distance3_ruby 1.824285 0.000000 1.824285 (1.824315)
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BDIGIT api is an internal ruby C api, and was removed from public api after merge of Bignum and Fixnum into Integer.
Using public API's rb_integer_pack which converts a ruby integer to array of C integers(or longs).
It is slower than the previous BDIGIT api, but much faster than ruby version
Tested on
cc #21