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Mike Bostock authored
When an ordinal scale’s range is explicitly defined as an array of values, we can build the domain implicitly by progressively assigning values from the range; this is commonly done with color palettes, for example. However, when an ordinal scale’s range is rather implied by chopping a continuous range into a series of points or bands, then the domain must be specified explicitly: for the scale to be consistent, we need to know the cardinality of the domain to compute the implied range values. Thus, it only makes sense to extend the domain implicitly when the range is specified explicitly. Fixes #1536 #1535.
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