Perl 6:maxpairs警告未定义值的字符串化

Question

看起来maxpairs不喜欢在具有未定义值的列表上调用:

> my @foo; @foo[2] = 4; say @foo.maxpairs;
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in block <unit> at <unknown file> line 1

(2 => 4)

max 没有相同的问题,似乎只是忽略未定义的值:

> my @foo; @foo[2] = 4; say @foo.max;
4

发生同样的错误:

> my @foo; @foo[2] = 4; say @foo.pairs.max(*.value)
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in block <unit> at <unknown file> line 1

2 => 4

因此,只有在max没有filter参数的情况下使用时,才会忽略未定义的值.

这是一个错误吗？

Answer 1

由于这看起来像一个bug,我已经修复了它

https://github.com/rakudo/rakudo/commit/7bf7a2c6f83a57713c

这也照顾"minpairs".