文件操作 - TODO
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文件: /usr/share/doc/perl-Math-BigRat/TODO
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* Make blog() handle exact cases correctly. E.g., (8/27) ** (2/3) = 4/9, so Math::BigRat -> new("4/9") -> blog("8/27") should return 2/3. * Rounding needs a new definiton: rounding to nearest fraction (see Knuth and fixed-slash fractions) * bmod(), bmodpow(), bmodinv() not fully/properly implemented yet. * BigRat does not handle modify() yet or in a very incomplete manner.
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