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If you want to avoid mutation in static method you need to clone it before usage.

XY = D.mul22(D.clone(X), Y)

Mutatatable variable tagged with exclamation mark (!)

Description	Static method	Instance method
Constructors	new D([a, b])
-//-	D.clone(X)
-//-	D.fromSum11(a, b)
-//-	D.fromMul11(a, b)
-//-	D.fromSqr1(a)
-//-	D.fromNumber(number)
-//-	D.fromString(string)
Converters		X.toNumber()
-//-		X.toExponential(precision)
Addition	D.add22(X!, Y)	X.add(Y)
-//-	D.add21(X!, a)	-//-
Subtraction	D.sub22(X!, Y)	X.sub(Y)
-//-	D.sub21(X!, a)	-//-
Multiplication	D.mul22(X!, Y)	X.mul(Y)
-//-	D.mul21(X!, a)	-//-
Mult. to a=2^n	D.mul21pow2(X!, a)
Division	D.div22(X!, a)	X.div(Y)
-//-	D.div21(X!, a)	-//-
Power	D.pow22(X!, Y)	X.pow(Y)
Power of integer	D.pow21n(X!, n)
Absolute value	D.abs2(X!)	X.abs()
Negate	D.neg2(X!)	X.neg()
Inverse	D.inv2(X!)	X.inv()
Square	D.sqr2(X!)	X.sqr()
Square root	D.sqrt2(X!)	X.sqrt()
Exponential fn.	D.exp2(X!)	X.exp()
Natural logarithm	D.ln2(X!)	X.ln()
Hyperbolic sine	D.sinh2(X!)	X.sinh()
Hyperbolic cosine	D.cosh2(X!)	X.cosh()
Equals	D.eq22(X, Y)	X.eq(Y)
-//-	D.eq21(X, a)	-//-
Not equal	D.ne22(X, Y)	X.ne(Y)
-//-	D.ne21(X, a)	-//-
Greater than	D.gt22(X, Y)	X.gt(Y)
-//-	D.gt21(X, a)	-//-
Greater or equal	D.ge22(X, Y)	X.ge(Y)
-//-	D.ge21(X, a)	-//-
Less than	D.lt22(X, Y)	X.lt(Y)
-//-	D.lt21(X, a)	-//-
Less or equal	D.le22(X, Y)	X.le(Y)
-//-	D.le21(X, a)	-//-

Example of usage you can find in sandbox or in benchmark.js