strike interpolateNumber from transition docs

per #67

README.md

@@ -12,7 +12,7 @@ d3.select("body")
 
 Transitions support most selection methods (such as [*transition*.attr](#transition_attr) and [*transition*.style](#transition_style) in place of [*selection*.attr](https://github.com/d3/d3-selection#selection_attr) and [*selection*.style](https://github.com/d3/d3-selection#selection_style)), but not all methods are supported; for example, you must [append](https://github.com/d3/d3-selection#selection_append) elements or [bind data](https://github.com/d3/d3-selection#joining-data) before a transition starts. A [*transition*.remove](#transition_remove) operator is provided for convenient removal of elements when the transition ends.
 
-To compute intermediate state, transitions leverage a variety of [built-in interpolators](https://github.com/d3/d3-interpolate). [Colors](https://github.com/d3/d3-interpolate#interpolateRgb), [numbers](https://github.com/d3/d3-interpolate#interpolateNumber), and [transforms](https://github.com/d3/d3-interpolate#interpolateTransform) are automatically detected. [Strings](https://github.com/d3/d3-interpolate#interpolateString) with embedded numbers are also detected, as is common with many styles (such as padding or font sizes) and paths. To specify a custom interpolator, use [*transition*.attrTween](#transition_attrTween), [*transition*.styleTween](#transition_styleTween) or [*transition*.tween](#transition_tween).
+To compute intermediate state, transitions leverage a variety of [built-in interpolators](https://github.com/d3/d3-interpolate). [Colors](https://github.com/d3/d3-interpolate#interpolateRgb), and [transforms](https://github.com/d3/d3-interpolate#interpolateTransform) are automatically detected. [Strings](https://github.com/d3/d3-interpolate#interpolateString) with embedded numbers are also detected, as is common with many styles (such as padding or font sizes) and paths. To specify a custom interpolator, use [*transition*.attrTween](#transition_attrTween), [*transition*.styleTween](#transition_styleTween) or [*transition*.tween](#transition_tween).
 
 ## Installing
 
@@ -203,9 +203,8 @@ For each selected element, assigns the [attribute tween](#transition_attrTween)
 
 If the target value is null, the attribute is removed when the transition starts. Otherwise, an interpolator is chosen based on the type of the target value, using the following algorithm:
 
-1. If *value* is a number, use [interpolateNumber](https://github.com/d3/d3-interpolate#interpolateNumber).
-2. If *value* is a [color](https://github.com/d3/d3-color#color) or a string coercible to a color, use [interpolateRgb](https://github.com/d3/d3-interpolate#interpolateRgb).
-3. Use [interpolateString](https://github.com/d3/d3-interpolate#interpolateString).
+1. If *value* is a [color](https://github.com/d3/d3-color#color) or a string coercible to a color, use [interpolateRgb](https://github.com/d3/d3-interpolate#interpolateRgb).
+2. Use [interpolateString](https://github.com/d3/d3-interpolate#interpolateString).
 
 To apply a different interpolator, use [*transition*.attrTween](#transition_attrTween).
 
@@ -249,9 +248,8 @@ For each selected element, assigns the [style tween](#transition_styleTween) for
 
 If the target value is null, the style is removed when the transition starts. Otherwise, an interpolator is chosen based on the type of the target value, using the following algorithm:
 
-1. If *value* is a number, use [interpolateNumber](https://github.com/d3/d3-interpolate#interpolateNumber).
-2. If *value* is a [color](https://github.com/d3/d3-color#color) or a string coercible to a color, use [interpolateRgb](https://github.com/d3/d3-interpolate#interpolateRgb).
-3. Use [interpolateString](https://github.com/d3/d3-interpolate#interpolateString).
+1. If *value* is a [color](https://github.com/d3/d3-color#color) or a string coercible to a color, use [interpolateRgb](https://github.com/d3/d3-interpolate#interpolateRgb).
+2. Use [interpolateString](https://github.com/d3/d3-interpolate#interpolateString).
 
 To apply a different interpolator, use [*transition*.styleTween](#transition_styleTween).