Trailing commas in metadata (meta/parameter_meta) arrays not allowed

[adthrasher]

I have run in to a case with our documentation where miniwdl flags a trailing comma in an array in a meta or parameter_meta section as problematic.

For example:

version 1.1

task foo {
    parameter_meta {
        bar: {
            suggestions: [1,2,3,],
            help: "bar",
            default: 1,
        }
    }
    input {
        Array[Int] bar = [1,2,3,]
    }
    
    command <<< >>>
}

Yields:

% miniwdl check tools/test.wdl
(tools/test.wdl Ln 6 Col 33) Unexpected token Token('STRING1_FRAGMENT', '],\n            help: "bar",\n            default: 1,\n        }\n    }\n    input {\n        Array[Int] bar = [1,2,3,]\n    }\n    \n    command <<< >>>\n}\n') at line 6, column 33.
Expected one of: 
        * FALSE
        * SIGNED_FLOAT
        * LBRACE
        * NONE
        * TRUE
        * FLOAT
        * ESCAPED_STRING
        * LSQB
        * INT
        * SIGNED_INT
        * ESCAPED_STRING1
Previous tokens: [Token('COMMA', ',')]

                suggestions: [1,2,3,],

I don't see this as being disallowed by the spec. I will note that the trailing comma is accepted for declarations.