Attributes with array of string constructor don't compile

Summary

It is not possible to use an attribute with constructor Create(Values: array of string);.

System Information

• Operating system: Windows
• Processor architecture: x86
• Compiler version: trunk
• Device: Computer

Example Project

program EnumAttrTest;

{$mode objfpc}{$H+}
{$modeswitch prefixedattributes}

uses
  SysUtils;

type
  EnumValues = class(TCustomAttribute)
  protected
    FValues: TStringArray;
  public
    constructor Create(Values: array of string);
  end;

  [EnumValues(['YES', 'NO', 'COULD_BE'])] // EnumAttrTest.lpr(17,16) Error: Ordinal expression expected
  TMyEnum = (meYes, meNo, meCouldBe);

const
  cValues2: array[0..2] of string = ('YES', 'NO', 'COULD_BE');
type
  [EnumValues(cValues2)] // EnumAttrTest.lpr(23,23) Error: Constant Expression expected
  TMyEnum2 = (me2Yes, me2No, me2CouldBe);

{ EnumValues }

constructor EnumValues.Create(Values: array of string);
begin
  FValues := Copy(Values, 0);
end;

begin
  EnumValues.Create(['YES', 'NO', 'COULD_BE']); // is OK
  EnumValues.Create(cValues2); // is OK
end.

What is the current bug behavior?

Compiler error when the attribute is used in the interface. When created as a normal class, everything is OK.

What is the expected (correct) behavior?

It should compile in the interface declaration as well.