Plot the density and mesh and overlay streamlines

Example 2 steps, run in order in one session. Every step was executed against the engine and the output below is what it produced.

f = Sin[x + y ^ 2];
gradient = Grad[f, {x, y}];

StreamDensityPlot[{gradient, f}, {x, -2, 2}, {y, -2, 2}, Mesh -> 5, ColorFunction -> "BeachColors", MaxRecursion -> 1]

-Graphics-

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