diff --git a/src/js/ibcJS.js b/src/js/ibcJS.js
index 7d82694b237d6a2e26bc43acce03b58e1daec54b..98b950302065c0bdb73b6ab7e7197a7b44a6d5d2 100644
--- a/src/js/ibcJS.js
+++ b/src/js/ibcJS.js
@@ -69,7 +69,7 @@ globalThis.ibc = (() => {
 
 	class CoancestryCache
 	{
-		#valuesByLeastParentId = {};
+		valuesByLeastParentId = {};
 
 		coefficientOfInbreeding(node) {
 			if (node._coeff === null)
@@ -85,7 +85,7 @@ globalThis.ibc = (() => {
 				// just two simple rules are needed to express it: self-with-self coancestry is (1 + coefficient of inbreeding of self) / 2, and...
 				return (1 + this.coefficientOfInbreeding(motherNode)) / 2;
 
-			return this.#kinship(motherNode.id, fatherNode.id,
+			return this.kinshipCache(motherNode.id, fatherNode.id,
 				() => {
 					let p1 = motherNode;
 					let p2 = fatherNode;
@@ -105,12 +105,12 @@ globalThis.ibc = (() => {
 				});
 		}
 
-		#kinship(motherId, fatherId, calculateValue) {  // this method exists solely for caching purposes
+		kinshipCache(motherId, fatherId, calculateValue) {  // this method exists solely for caching purposes
 			let id1 = motherId;
 			let id2 = fatherId;
 			if (id1 > id2) { let id_ = id1; id1 = id2; id2 = id_; }
 
-			let vs = this.#valuesByLeastParentId;
+			let vs = this.valuesByLeastParentId;
 
 			let vs1 = vs[id1];
 			if (vs1 === undefined)
@@ -118,10 +118,10 @@ globalThis.ibc = (() => {
 
 			// cache format, conceptually: a set of arrays of numbers.  the top-level set is indexed by id1.  a lower-level array has the format
 			// [id, kinship value, id, kinship value, ...] with the id in an entry corresponding to id2 here and with the pairs in the array being kept invariably sorted by id.
-			return this.#kinship_(vs1, id2, calculateValue);
+			return this.kinship_cache(vs1, id2, calculateValue);
 		}
 
-		#kinship_(vs, id, calculateValue) {  // this method exists solely for caching purposes
+		kinship_cache(vs, id, calculateValue) {  // this method exists solely for caching purposes
 			let entryCount = vs.length / 2;
 
 			// do a simple binary search
@@ -418,16 +418,16 @@ globalThis.ibc = (() => {
 
 		class MockWorld
 		{
-			#slaves;
+			slavesArray;
 
 			constructor(matings) {
-				this.#slaves = [];
+				this.slavesArray = [];
 
 				let slavesById = {};
 				let meetSlave = (id) => {
 					if (!slavesById[id]) {
 						let slave = new MockSlave(id);
-						this.#slaves.push(slave);
+						this.slavesArray.push(slave);
 						slavesById[id] = slave;
 					}
 
@@ -446,7 +446,7 @@ globalThis.ibc = (() => {
 			}
 
 			findSlaveState(id) {
-				return this.#slaves.find(slave => slave.ID === id) || null;
+				return this.slavesArray.find(slave => slave.ID === id) || null;
 			}
 		}