Performance issues with ModelUtils._coerce and coerceArray

Describe the bug

The way ModelUtils._coerce uses coerceArray is inefficient, and is causing it to show up as 20% of my application's CPU usage in profiler runs under a create heavy workload.

The problem code is this in juggler:

    try {
      // Coerce val into an array if it resembles an array-like object
      val = coerceArray(val);
    } catch (e) {
      // NOOP when not coercable into an array.
    }

Throwing and catching an error is much more expensive than returning a value, and nearly every call to _coerce hits this try/throw/catch path.

A variant of coerceArray that doesn't throw, but instead returns [arrayVal | undefined, coerced: boolean] I think would fix the performance problem here.

Logs

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Additional information

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Reproduction

design issue

Inizia in lib/model-utils.js intorno alle righe 498-503, dove ModelUtils._coerce chiama coerceArray nel percorso try/catch. Esamina il comportamento di coerceArray e il carico di lavoro create-heavy descritto nell'issue, quindi verifica che la coercizione mantenga il comportamento esistente senza il costo ripetuto delle eccezioni e conferma il miglioramento tramite profiling.