Not easy to have integer scale

[Adam Borowski]

I have a chart with linear scale axis.
Now if I want to have integers only on axis, I have to override scale.ticks() method which isn't an elegant way to do that:

    const _ticks = y.ticks;
    y.ticks = (...args) => {
        const ticks = _ticks.apply(y, args);
        return ticks.filter(a => Math.floor(a) === a);
    };

Any ideas how to improve tick generation customization?
Maybe ticks generator function as an option of axis, then having built-in multiple ticks generator functions?

[Mike Bostock]

Use axis.tickValues.

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