diff --git a/packages/squiggle-lang/src/rescript/GenericDist/GenericDist.res b/packages/squiggle-lang/src/rescript/GenericDist/GenericDist.res
index 56a086ca..48588afe 100644
--- a/packages/squiggle-lang/src/rescript/GenericDist/GenericDist.res
+++ b/packages/squiggle-lang/src/rescript/GenericDist/GenericDist.res
@@ -41,7 +41,7 @@ let operationToFloat = (t, toPointSet: toPointSetFn, fnName) => {
 
   switch symbolicSolution {
   | Some(r) => Ok(r)
-  | None => toPointSet(t)->E.R.fmap2(PointSetDist.operate(fnName))
+  | None => toPointSet(t)->E.R2.fmap(PointSetDist.operate(fnName))
   }
 }
 
@@ -95,7 +95,7 @@ module Truncate = {
       switch trySymbolicSimplification(leftCutoff, rightCutoff, t) {
       | Some(r) => Ok(r)
       | None =>
-        toPointSet(t)->E.R.fmap2(t =>
+        toPointSet(t)->E.R2.fmap(t =>
           #PointSet(PointSetDist.T.truncate(leftCutoff, rightCutoff, t))
         )
       }
@@ -134,7 +134,7 @@ module AlgebraicCombination = {
     t1: t,
     t2: t,
   ) =>
-    E.R.merge(toPointSet(t1), toPointSet(t2))->E.R.fmap2(((a, b)) =>
+    E.R.merge(toPointSet(t1), toPointSet(t2))->E.R2.fmap(((a, b)) =>
       PointSetDist.combineAlgebraically(operation, a, b)
     )
 
@@ -145,8 +145,8 @@ module AlgebraicCombination = {
     t2: t,
   ) => {
     let operation = Operation.Algebraic.toFn(operation)
-    E.R.merge(toSampleSet(t1), toSampleSet(t2)) -> E.R.fmap2(((a, b)) => {
-      Belt.Array.zip(a, b) -> E.A.fmap2(((a, b)) => operation(a, b))
+    E.R.merge(toSampleSet(t1), toSampleSet(t2))->E.R2.fmap(((a, b)) => {
+      Belt.Array.zip(a, b)->E.A2.fmap(((a, b)) => operation(a, b))
     })
   }
 
@@ -155,7 +155,7 @@ module AlgebraicCombination = {
     switch x {
     | #Symbolic(#Float(_)) => 1
     | #Symbolic(_) => 1000
-    | #PointSet(Discrete(m)) => m.xyShape -> XYShape.T.length
+    | #PointSet(Discrete(m)) => m.xyShape->XYShape.T.length
     | #PointSet(Mixed(_)) => 1000
     | #PointSet(Continuous(_)) => 1000
     | _ => 1000
@@ -179,9 +179,9 @@ module AlgebraicCombination = {
     | None =>
       switch chooseConvolutionOrMonteCarlo(t1, t2) {
       | #CalculateWithMonteCarlo =>
-        runMonteCarlo(toSampleSet, algebraicOp, t1, t2)->E.R.fmap2(r => #SampleSet(r))
+        runMonteCarlo(toSampleSet, algebraicOp, t1, t2)->E.R2.fmap(r => #SampleSet(r))
       | #CalculateWithConvolution =>
-        runConvolution(toPointSet, algebraicOp, t1, t2)->E.R.fmap2(r => #PointSet(r))
+        runConvolution(toPointSet, algebraicOp, t1, t2)->E.R2.fmap(r => #PointSet(r))
       }
     }
   }
@@ -195,10 +195,10 @@ let pointwiseCombination = (t1: t, toPointSet: toPointSetFn, operation, t2: t):
   error,
 > => {
   E.R.merge(toPointSet(t1), toPointSet(t2))
-  ->E.R.fmap2(((t1, t2)) =>
+  ->E.R2.fmap(((t1, t2)) =>
     PointSetDist.combinePointwise(GenericDist_Types.Operation.arithmeticToFn(operation), t1, t2)
   )
-  ->E.R.fmap2(r => #PointSet(r))
+  ->E.R2.fmap(r => #PointSet(r))
 }
 
 let pointwiseCombinationFloat = (
@@ -210,7 +210,7 @@ let pointwiseCombinationFloat = (
   switch operation {
   | #Add | #Subtract => Error(GenericDist_Types.DistributionVerticalShiftIsInvalid)
   | (#Multiply | #Divide | #Exponentiate | #Log) as operation =>
-    toPointSet(t)->E.R.fmap2(t => {
+    toPointSet(t)->E.R2.fmap(t => {
       //TODO: Move to PointSet codebase
       let fn = (secondary, main) => Operation.Scale.toFn(operation, main, secondary)
       let integralSumCacheFn = Operation.Scale.toIntegralSumCacheFn(operation)
@@ -222,10 +222,10 @@ let pointwiseCombinationFloat = (
         t,
       )
     })
-  }->E.R.fmap2(r => #PointSet(r))
+  }->E.R2.fmap(r => #PointSet(r))
 }
 
-//Note: The result should always cumulatively sum to 1.
+//Note: The result should always cumulatively sum to 1. This would be good to test.
 let mixture = (
   values: array<(t, float)>,
   scaleMultiply: scaleMultiplyFn,
@@ -234,10 +234,10 @@ let mixture = (
   if E.A.length(values) == 0 {
     Error(GenericDist_Types.Other("mixture must have at least 1 element"))
   } else {
-    let totalWeight = values->E.A.fmap2(E.Tuple2.second)->E.A.Floats.sum
+    let totalWeight = values->E.A2.fmap(E.Tuple2.second)->E.A.Floats.sum
     let properlyWeightedValues =
       values
-      ->E.A.fmap2(((dist, weight)) => scaleMultiply(dist, weight /. totalWeight))
+      ->E.A2.fmap(((dist, weight)) => scaleMultiply(dist, weight /. totalWeight))
       ->E.A.R.firstErrorOrOpen
     properlyWeightedValues->E.R.bind(values => {
       values
diff --git a/packages/squiggle-lang/src/rescript/GenericDist/GenericDist_GenericOperation.res b/packages/squiggle-lang/src/rescript/GenericDist/GenericDist_GenericOperation.res
index c3aa71f8..43aec78f 100644
--- a/packages/squiggle-lang/src/rescript/GenericDist/GenericDist_GenericOperation.res
+++ b/packages/squiggle-lang/src/rescript/GenericDist/GenericDist_GenericOperation.res
@@ -93,7 +93,7 @@ let rec run = (extra, fnName: operation): outputType => {
   let fromDistFn = (subFn: GenericDist_Types.Operation.fromDist, dist: genericDist) =>
     switch subFn {
     | #toFloat(fnName) =>
-      GenericDist.operationToFloat(dist, toPointSet, fnName)->E.R.fmap2(r => #Float(r))->fromResult
+      GenericDist.operationToFloat(dist, toPointSet, fnName)->E.R2.fmap(r => #Float(r))->fromResult
     | #toString => dist->GenericDist.toString->(r => #String(r))
     | #toDist(#consoleLog) => {
         Js.log2("Console log requested: ", dist)
@@ -101,26 +101,26 @@ let rec run = (extra, fnName: operation): outputType => {
       }
     | #toDist(#normalize) => dist->GenericDist.normalize->(r => #Dist(r))
     | #toDist(#truncate(left, right)) =>
-      dist->GenericDist.truncate(toPointSet, left, right)->E.R.fmap2(r => #Dist(r))->fromResult
+      dist->GenericDist.truncate(toPointSet, left, right)->E.R2.fmap(r => #Dist(r))->fromResult
     | #toDist(#toPointSet) =>
-      dist->GenericDist.toPointSet(xyPointLength)->E.R.fmap2(r => #Dist(#PointSet(r)))->fromResult
+      dist->GenericDist.toPointSet(xyPointLength)->E.R2.fmap(r => #Dist(#PointSet(r)))->fromResult
     | #toDist(#toSampleSet(n)) =>
-      dist->GenericDist.sampleN(n)->E.R.fmap2(r => #Dist(#SampleSet(r)))->fromResult
+      dist->GenericDist.sampleN(n)->E.R2.fmap(r => #Dist(#SampleSet(r)))->fromResult
     | #toDistCombination(#Algebraic, _, #Float(_)) => #Error(NotYetImplemented)
     | #toDistCombination(#Algebraic, operation, #Dist(dist2)) =>
       dist
       ->GenericDist.algebraicCombination(toPointSet, toSampleSet, operation, dist2)
-      ->E.R.fmap2(r => #Dist(r))
+      ->E.R2.fmap(r => #Dist(r))
       ->fromResult
     | #toDistCombination(#Pointwise, operation, #Dist(dist2)) =>
       dist
       ->GenericDist.pointwiseCombination(toPointSet, operation, dist2)
-      ->E.R.fmap2(r => #Dist(r))
+      ->E.R2.fmap(r => #Dist(r))
       ->fromResult
     | #toDistCombination(#Pointwise, operation, #Float(f)) =>
       dist
       ->GenericDist.pointwiseCombinationFloat(toPointSet, operation, f)
-      ->E.R.fmap2(r => #Dist(r))
+      ->E.R2.fmap(r => #Dist(r))
       ->fromResult
     }
 
@@ -128,7 +128,7 @@ let rec run = (extra, fnName: operation): outputType => {
   | #fromDist(subFn, dist) => fromDistFn(subFn, dist)
   | #fromFloat(subFn, float) => reCall(~fnName=#fromDist(subFn, GenericDist.fromFloat(float)), ())
   | #mixture(dists) =>
-    dists->GenericDist.mixture(scaleMultiply, pointwiseAdd)->E.R.fmap2(r => #Dist(r))->fromResult
+    dists->GenericDist.mixture(scaleMultiply, pointwiseAdd)->E.R2.fmap(r => #Dist(r))->fromResult
   }
 }
 
@@ -147,5 +147,5 @@ let fmap = (
   | (#fromDist(_), _) => Error(Other("Expected dist, got something else"))
   | (#fromFloat(_), _) => Error(Other("Expected float, got something else"))
   }
-  newFnCall->E.R.fmap2(r => run(extra, r))->fromResult
+  newFnCall->E.R2.fmap(r => run(extra, r))->fromResult
 }
diff --git a/packages/squiggle-lang/src/rescript/utility/E.res b/packages/squiggle-lang/src/rescript/utility/E.res
index 69d8ecc1..121ecb91 100644
--- a/packages/squiggle-lang/src/rescript/utility/E.res
+++ b/packages/squiggle-lang/src/rescript/utility/E.res
@@ -148,7 +148,6 @@ module R = {
   let result = Rationale.Result.result
   let id = e => e |> result(U.id, U.id)
   let fmap = Rationale.Result.fmap
-  let fmap2 = (a,b) => Rationale.Result.fmap(b,a)
   let bind = Rationale.Result.bind
   let toExn = Belt.Result.getExn
   let default = (default, res: Belt.Result.t<'a, 'b>) =>
@@ -172,6 +171,10 @@ module R = {
     errorCondition(r) ? Error(errorMessage) : Ok(r)
 }
 
+module R2 = {
+  let fmap = (a,b) => R.fmap(b,a)
+}
+
 let safe_fn_of_string = (fn, s: string): option<'a> =>
   try Some(fn(s)) catch {
   | _ => None
@@ -245,7 +248,6 @@ module L = {
 /* A for Array */
 module A = {
   let fmap = Array.map
-  let fmap2 = (a,b) => Array.map(b,a)
   let fmapi = Array.mapi
   let to_list = Array.to_list
   let of_list = Array.of_list
@@ -448,6 +450,10 @@ module A = {
   }
 }
 
+module A2 = {
+  let fmap = (a,b) => A.fmap(b,a)
+}
+
 module JsArray = {
   let concatSomes = (optionals: Js.Array.t<option<'a>>): Js.Array.t<'a> =>
     optionals