[perl #127162] Plural parameter names are alowed in .later and .earlier but not in .new (DateTime.new(years => 2016))

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# New Ticket Created by  Alex Jakimenko 
# Please include the string:  [perl #127162]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=127162 >


“year” is allowed everywhere:

Code:
say DateTime.new(year => -50).later(year => 50);

Result
0000-01-01T00:00:00


“years” is allowed in .later:

Code:
say DateTime.new(year => -50).later(years => 50);

Result
0000-01-01T00:00:00


Yet this is not allowed:

Code:
say DateTime.new(years => -50).later(years => 50);

Result
Cannot make a DateTime object using .new
  in block <unit> at -e line 1

Actually thrown at:
  in any  at gen/moar/m-Metamodel.nqp line 3041
  in block <unit> at -e line 1



<flussence> why does .later allow "year" and "years", but DateTime.new
doesn't?

Indeed, not TIMTOWTDI-ish enough.
Also, if there is a final decision that it should not be allowed, then at
least the error message should not be LTA.