365365365365365365x^2  NB. extended precision is nice
133491850208566925016658299941583225

   36 ": 365365365365365365^2  NB. Speed demands approximations
133491850208566926593356837672714240

But it went right past me that 8!: forces return to float and
gives rather zany results...

   'c0' 8!:2 ] 365365365365365365x^2
133,491,850,208,566,945,040,100,911,382,265,856

For the want of a , the sense was lost...

   '0' 8!:2 ] 365365365365365365x^2
133491850208566945040100911382265856

   '0' 8!:2 ] 365365365365365365^2
133491850208566926593356837672714240

   365365365365365365x^2
133491850208566925016658299941583225

IMHO, it would be a good idea to include a comment in the 8!:
documentation page that expands on the description - "y is
usually an array of real numbers." to the effect that extended
integers may cause erratic results.

- joey
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