The argument type 'double' can't be assigned to the parameter type 'double'

I have a function that takes double as input and I'm passing a double value. I then get the error message:

The argument type 'double' can't be assigned to the parameter type 'double'

for (var i = 0; i < found.length; i++) {
  final double f = found[i];

  if (_aboveTreshold(f)) {
    ....
  }
}

And the method of signature is quite simple.

bool _aboveTreshold(double value) {

...
}

Is it really not possible to have a double as a parameter or am I doing something wrong?

This is an unexpected error message for me.

Why shouldn't 'double' be 'double'?

So as a workaround I made the function generic and then cast the value back to double. This is a dirty workaround. Is there a better way?

bool _aboveTreshold<T>(T value) {
  final v = value as double;

  ....
}

EDIT

Here's more code from the TFLite example to understand where 'found' comes from. It's 'List<double>' that I get.

final interpreter = await _loadModel('assets/tf_lite_models/mobilenet_v1_1.0_128_1_default_1.tflite');
final imageMatrix = _buildImageMatrix(imageBytes, 128, 128);

final input = [imageMatrix];
final output = [List<double>.filled(1001, 0)];

interpreter.run(input, output);

var foundedLabels = _runClassification(output.first).keys.join(',');

the method:

 Map<String, double> _runClassification<double>(List<double> found) {
    final classification = <String, double>{};

    for (int i = 0; i < found.length; i++) {

      if (_aboveTreshold(found[i])) {
        classification[_labels[i]] = found[i];
      }
    }      

    return classification;
  }
}

In the development environment, the value is also displayed as List<double>.

I now have a solution which is pretty weird, but it worked so I don't need a workaround anymore. If you have this weird problem too, I hope it helps.

The original if condition didn't work. I couldn't compare two doubles. Then I outsourced the if condition to a function and the error described above came up. As a workaround I made this function generic.

But after a bit of tweaking back and forth, I was able to fix all the bugs.

First, I removed the '_aboveTreshold' function. Now the original error came back that I can't compare found[i] with a double.

if (found[i] >= 0.9)

To fix that, I did the generic methods trick again. I turned _runClassification into a generic method.

 Map<String, T> _runClassification<T>(List<T> found) {
    final classification = <String, T>{};

    for (int i = 0; i < found.length; i++) {

      if ((found[i] as double) >= 0.900) {
        classification[_labels[i]] = found[i];
      }
    }      

    return classification;
  }
}

After that, the error messages were gone again in principle. Then save again and use the debugger.

In the end I also removed the second workaround and now it works without workarounds. It took a few tries.

  Map<String, double> _runClassification(List<double> found) {
    final classification = <String, double>{};

    for (int i = 0; i < found.length; i++) {
      if (found[i] >= 0.9) {
        classification[_labels[i]] = found[i];
      }
    }

    return classification;
  }

I hope this helps anyone who has this for no reason.