Problems in dart:args with camelCase keys

[DartBot]

This issue was originally filed by [email protected]

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What steps will reproduce the problem?

import('dart:args');

void main() {
  var keys = [ "upper_case", "camelCase", "camelcase" ];

  for(var key in keys) {
    var parser = new ArgParser();
    parser.addOption(key, defaultsTo: '');
    var res = parser.parse(["--$key", "hasValue"]);
    var value = res[key];
    print('$key: $value');
  }
}

What is the expected output?
upper_case: hasValue
camelCase: hasValue
camelcase: hasValue

What do you see instead?
upper_case: hasValue
camelCase:
camelcase: hasValue

[larsbak]

Set owner to @munificent.
Added Area-Library label.

[larsbak]

Added Triaged label.

[DartBot]

This comment was originally written by @butlermatt

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I was going to make an attempt at this. But it appears that this has already been resolved.

In SDK build: 12784 (64-Bit Linux)

The following code works as expected:
#import('packages/args/args.dart');

void main() {
  var keys = [ "upper_case", "camelCase", "camelcase" ];
  var parser = new ArgParser();
  for(var key in keys) {
    parser.addOption(key, defaultsTo: '');
  }
  
  var res = parser.parse(['--upper_case', 'hasValue', '--camelCase', 'hasValue',
                          '--camelcase', 'hasValue']);
  var opts = res.options;
  for(var val in opts) {
    print('$val: ${res[val]}');
  }
}

== Output ==
upper_case: hasValue
camelCase: hasValue
camelcase: hasValue
============

[munificent]

Cool, thanks for looking into it! I'll close it then.

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Added Fixed label.