d3.interpolateNumber(a, b) Returns an interpolator between the two numbers a and b. The returned interpolator
d3.interpolateLab(a, b)
d3.interpolateArray(a, b) Returns an interpolator between the two arrays a and b. Internally, an array
d3.interpolateString(a, b) Returns an interpolator between the two strings a and b. The string interpolator
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