Status: New
Owner: ----
New issue 3529 by [email protected]: Array stuck in smi mode.
http://code.google.com/p/v8/issues/detail?id=3529
The issue first surfaced in this Chrome-specific bug report:
https://github.com/mbostock/topojson/issues/192
The issue occurred in topojson.presimplify. This operates on "arcs"; each
arc is an array of points. Each point is a two-element array. These
points are transformed and delta-encoded as integers initially.
topojson.presimplify decodes these points to "absolute" coordinates, and
then turns each point into a three-element array; the third element being a
special "effective area" (float).
Further investigation revealed that the third elements for these arrays
appeared to be a smi, perhaps because V8 thinks the array is still entirely
smi even though a floating point element has been added.
This simple workaround fixed the issue by creating a new array instance
prior to adding the third floating point element:
https://github.com/mbostock/topojson/pull/193
It seems like the initial delta encoding makes V8 correctly treat each
point as being smi, but the subsequent transformations (both absolute
transformation and addition of area element) mean the points should no
longer be smi-only.
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