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lua_api.txt: improve vector documentation
Before it rendered very badly in HTML. Also point out what vector.round does.
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@ -1688,16 +1688,15 @@ or string form, a ColorString (defined above):
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`colorspec = "green"`
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Spatial Vectors
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--------------
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* `vector.new([x[, y, z]])`: returns a vector.
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* `x` is a table or the `x` position.
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---------------
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* `vector.new(a[, b, c])`: returns a vector:
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* A copy of `a` if `a` is a vector.
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* `{x = a, y = b, z = c}`, if all `a, b, c` are defined
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* `vector.direction(p1, p2)`: returns a vector
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* `vector.distance(p1, p2)`: returns a number
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* `vector.length(v)`: returns a number
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* `vector.normalize(v)`: returns a vector
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* `vector.round(v)`: returns a vector
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* `vector.round(v)`: returns a vector, each dimension rounded to floor
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* `vector.apply(v, func)`: returns a vector
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* `vector.equals(v1, v2)`: returns a boolean
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@ -1709,7 +1708,7 @@ For the following functions `x` can be either a vector or a number:
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* `vector.divide(v, x)`: returns a scaled vector or Schur quotient
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Helper functions
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-----------------
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----------------
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* `dump2(obj, name="_", dumped={})`
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* Return object serialized as a string, handles reference loops
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* `dump(obj, dumped={})`
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