• Reduced test suite peak memory consumption by 5-10 meg
  
• Added the 'distinct' alias for the uniq function, for people that
  like their chained map/grep/sort pipelines with a SQL'ish flavour.
  
• Expanded test suite for the any() group of functions.
  
• The any() group of functions now strictly always return scalar
  boolean true, false and undef to match the XS version.