function createStream1( mu, b ) {
		return new RandomStream( mu, b, opts );
	}
Returns a readable stream for generating pseudorandom numbers drawn from a Laplace (double exponential) distribution.

@private
@param {number} mu - mean
@param {PositiveNumber} b - scale parameter
@throws {TypeError} `mu` must be a number
@throws {TypeError} `b` must be a positive number
@throws {TypeError} options argument must be an object
@throws {TypeError} must provide valid options
@throws {Error} must provide a valid state
@returns {RandomStream} Stream instance