Author: lwall Date: 2009-10-22 18:21:29 +0200 (Thu, 22 Oct 2009) New Revision: 28882
Modified: docs/Perl6/Spec/S02-bits.pod Log: [S02] tweak Rat to max out at rat64 by default Modified: docs/Perl6/Spec/S02-bits.pod =================================================================== --- docs/Perl6/Spec/S02-bits.pod 2009-10-22 15:55:21 UTC (rev 28881) +++ docs/Perl6/Spec/S02-bits.pod 2009-10-22 16:21:29 UTC (rev 28882) @@ -672,6 +672,15 @@ Numeric values in untyped variables use C<Int> and C<Num> semantics rather than C<int> and C<num>. +However, for pragmatic reasons, C<Rat> values are guaranteed to be +exact only up to a certain point. By default, this is the precision +that would be represented by a C<rat64> type, that is, with a numerator +and denominator consisting of C<int64> values. C<Rat>s that would require +more than 64 bits of storage in either numerator or denominator are +automatically converted to C<Num>s. (If rationals are defined by a +role, it may be possible to instantiate a C<Rat> type with a different +maximum precision.) + =item * Perl 6 should by default make standard IEEE floating point concepts
