metric processor: `Handler error: value … is negative`

[timka]

      metric:
        name: indicator
        type: gauge
        labels:
          indicator_name: ${! json("indicator") }
        value: ${! json("value") }

The above processor gives me errors like: Handler error: value -0.000091 is negative. Also the doc says it must be a positive number. But it's perfectly correct for a gauge metric to have negative values. The Prometheus spec says:

value is a float represented as required by Go's ParseFloat() function. In addition to standard numerical values, NaN, +Inf, and -Inf are valid values representing not a number, positive infinity, and negative infinity, respectively.

rpk connect --version
Version: 4.75.0
Date: 2025-12-15T20:23:55Z

[timka]

AFAIU, reusing withNumberStr in handleGauge is incorrect. I think handleGauge needs a different version of withNumberStr that handles negative values properly.