Additional "artifact" circles when using data-driven-styling by zoom on 'circle-radius'

[kdanaher]

mapbox-gl-js version: 0.44.1

Steps to Trigger Behavior

1. Add layer of 'type': 'circle' and style circle-radius with data driven styling factoring zoom level
2. Tested using both older stops method as well as newer expressions method.

Expected Behavior

In a previous API version (0.32.1)

Actual Behavior

As stated above, I've styled circle-radius using the older and newer methods:

Older "stops" method

'circle-radius': {
    property: property_id,
    type: 'exponential',
    stops: [[{"zoom": 4,"value": circle_sizes[0]}, 1],
            [{"zoom": 4,"value": circle_sizes[2]}, 9],
            [{"zoom": 5,"value": circle_sizes[0]}, 2],
            [{"zoom": 5,"value": circle_sizes[2]}, 18],
            [{"zoom": 6,"value": circle_sizes[0]}, 4],
            [{"zoom": 6,"value": circle_sizes[2]}, 36],
            [{"zoom": 7,"value": circle_sizes[0]}, 8],
            [{"zoom": 7,"value": circle_sizes[2]}, 72],
            [{"zoom": 8,"value": circle_sizes[0]}, 16],
            [{"zoom": 8,"value": circle_sizes[2]}, 144]]
}

Newer expressions method

'circle-radius': [
    "interpolate",
    ["exponential", 1],
    ["zoom"],
    4, ["sqrt", ["*", ["get", property_id], 5]],
    8, ["sqrt", ["*", ["get", property_id], 160]]
]

[jfirebaugh]

Thanks for the report @kdanaher. Could you please create a minimal self-contained example on jsbin.com that demonstrates the issue?

[kdanaher]

Surely -- http://jsbin.com/yobagowica/edit?html,output

The "artifact" circles seem to appear on exact zoom levels. In the linked jsbin, it can be noticeably triggered at z6. Depending on how I write the expression/stops it seems to get better/worse.

[jfirebaugh]

Thanks! This is a duplicate of #5829 / #4691.

[jfirebaugh]

→ #6768