diff --git a/src/components/drawing/index.js b/src/components/drawing/index.js
index c0d8922a457..d8f99f96535 100644
--- a/src/components/drawing/index.js
+++ b/src/components/drawing/index.js
@@ -217,21 +217,31 @@ drawing.symbolList = [];
 
 Object.keys(SYMBOLDEFS).forEach(function(k) {
     var symDef = SYMBOLDEFS[k];
-    drawing.symbolList = drawing.symbolList.concat(
-        [symDef.n, k, symDef.n + 100, k + '-open']);
-    drawing.symbolNames[symDef.n] = k;
-    drawing.symbolFuncs[symDef.n] = symDef.f;
+    var n = symDef.n;
+    drawing.symbolList.push(
+        n,
+        k,
+        n + 100,
+        k + '-open'
+    );
+    drawing.symbolNames[n] = k;
+    drawing.symbolFuncs[n] = symDef.f;
+
     if(symDef.needLine) {
-        drawing.symbolNeedLines[symDef.n] = true;
+        drawing.symbolNeedLines[n] = true;
     }
     if(symDef.noDot) {
-        drawing.symbolNoDot[symDef.n] = true;
+        drawing.symbolNoDot[n] = true;
     } else {
-        drawing.symbolList = drawing.symbolList.concat(
-            [symDef.n + 200, k + '-dot', symDef.n + 300, k + '-open-dot']);
+        drawing.symbolList.push(
+            n + 200,
+            k + '-dot',
+            n + 300,
+            k + '-open-dot'
+        );
     }
     if(symDef.noFill) {
-        drawing.symbolNoFill[symDef.n] = true;
+        drawing.symbolNoFill[n] = true;
     }
 });
 
@@ -253,8 +263,9 @@ drawing.symbolNumber = function(v) {
         v = drawing.symbolNames.indexOf(v);
         if(v >= 0) { v += vbase; }
     }
-    if((v % 100 >= MAXSYMBOL) || v >= 400) { return 0; }
-    return Math.floor(Math.max(v, 0));
+
+    return (v % 100 >= MAXSYMBOL || v >= 400) ?
+        0 : Math.floor(Math.max(v, 0));
 };
 
 function makePointPath(symbolNumber, r) {
diff --git a/src/traces/scattergl/convert.js b/src/traces/scattergl/convert.js
index a0088cb696f..bed3fa3ca79 100644
--- a/src/traces/scattergl/convert.js
+++ b/src/traces/scattergl/convert.js
@@ -21,6 +21,7 @@ var formatColor = require('../../lib/gl_format_color').formatColor;
 var subTypes = require('../scatter/subtypes');
 var makeBubbleSizeFn = require('../scatter/make_bubble_size_func');
 
+var helpers = require('./helpers');
 var constants = require('./constants');
 var DESELECTDIM = require('../../constants/interactions').DESELECTDIM;
 
@@ -59,7 +60,7 @@ function convertStyle(gd, trace) {
         opts.markerSel = convertMarkerSelection(trace, trace.selected);
         opts.markerUnsel = convertMarkerSelection(trace, trace.unselected);
 
-        if(!trace.unselected && Array.isArray(trace.marker.opacity)) {
+        if(!trace.unselected && Lib.isArrayOrTypedArray(trace.marker.opacity)) {
             var mo = trace.marker.opacity;
             opts.markerUnsel.opacity = new Array(mo.length);
             for(i = 0; i < mo.length; i++) {
@@ -187,15 +188,18 @@ function convertTextStyle(gd, trace) {
         optsOut.color = tfc;
     }
 
-    if(Array.isArray(tfs) || Array.isArray(tff)) {
+    if(Lib.isArrayOrTypedArray(tfs) || Array.isArray(tff)) {
         // if any textfont param is array - make render a batch
         optsOut.font = new Array(count);
         for(i = 0; i < count; i++) {
             var fonti = optsOut.font[i] = {};
 
-            fonti.size = Array.isArray(tfs) ?
-                (isNumeric(tfs[i]) ? tfs[i] : 0) :
-                tfs;
+            fonti.size = (
+                Lib.isTypedArray(tfs) ? tfs[i] :
+                Array.isArray(tfs) ? (
+                    isNumeric(tfs[i]) ? tfs[i] : 0
+                ) : tfs
+            );
 
             fonti.family = Array.isArray(tff) ? tff[i] : tff;
         }
@@ -214,7 +218,7 @@ function convertMarkerStyle(trace) {
     var optsOut = {};
     var i;
 
-    var multiSymbol = Array.isArray(optsIn.symbol);
+    var multiSymbol = Lib.isArrayOrTypedArray(optsIn.symbol);
     var multiColor = Lib.isArrayOrTypedArray(optsIn.color);
     var multiLineColor = Lib.isArrayOrTypedArray(optsIn.line.color);
     var multiOpacity = Lib.isArrayOrTypedArray(optsIn.opacity);
@@ -222,7 +226,7 @@ function convertMarkerStyle(trace) {
     var multiLineWidth = Lib.isArrayOrTypedArray(optsIn.line.width);
 
     var isOpen;
-    if(!multiSymbol) isOpen = constants.OPEN_RE.test(optsIn.symbol);
+    if(!multiSymbol) isOpen = helpers.isOpenSymbol(optsIn.symbol);
 
     // prepare colors
     if(multiSymbol || multiColor || multiLineColor || multiOpacity) {
@@ -253,7 +257,7 @@ function convertMarkerStyle(trace) {
         for(i = 0; i < count; i++) {
             if(multiSymbol) {
                 var symbol = optsIn.symbol[i];
-                isOpen = constants.OPEN_RE.test(symbol);
+                isOpen = helpers.isOpenSymbol(symbol);
             }
             if(isOpen) {
                 borderColors[i] = colors[i].slice();
@@ -398,7 +402,7 @@ function getSymbolSdf(symbol) {
     var symbolNoDot = !!Drawing.symbolNoDot[symbolNumber % 100];
     var symbolNoFill = !!Drawing.symbolNoFill[symbolNumber % 100];
 
-    var isDot = constants.DOT_RE.test(symbol);
+    var isDot = helpers.isDotSymbol(symbol);
 
     // get symbol sdf from cache or generate it
     if(SYMBOL_SDF[symbol]) return SYMBOL_SDF[symbol];
diff --git a/src/traces/scattergl/defaults.js b/src/traces/scattergl/defaults.js
index b66c7e9a1ed..a30becb09ee 100644
--- a/src/traces/scattergl/defaults.js
+++ b/src/traces/scattergl/defaults.js
@@ -11,6 +11,7 @@
 var Lib = require('../../lib');
 var Registry = require('../../registry');
 
+var helpers = require('./helpers');
 var attributes = require('./attributes');
 var constants = require('../scatter/constants');
 var subTypes = require('../scatter/subtypes');
@@ -25,7 +26,7 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
         return Lib.coerce(traceIn, traceOut, attributes, attr, dflt);
     }
 
-    var isOpen = traceIn.marker ? /-open/.test(traceIn.marker.symbol) : false;
+    var isOpen = traceIn.marker ? helpers.isOpenSymbol(traceIn.marker.symbol) : false;
     var isBubble = subTypes.isBubble(traceIn);
 
     var len = handleXYDefaults(traceIn, traceOut, layout, coerce);
diff --git a/src/traces/scattergl/helpers.js b/src/traces/scattergl/helpers.js
new file mode 100644
index 00000000000..f2be43a0a16
--- /dev/null
+++ b/src/traces/scattergl/helpers.js
@@ -0,0 +1,23 @@
+/**
+* Copyright 2012-2020, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+var constants = require('./constants');
+
+exports.isOpenSymbol = function(symbol) {
+    return (typeof symbol === 'string') ?
+        constants.OPEN_RE.test(symbol) :
+        symbol % 200 > 100;
+};
+
+exports.isDotSymbol = function(symbol) {
+    return (typeof symbol === 'string') ?
+        constants.DOT_RE.test(symbol) :
+        symbol > 200;
+};
diff --git a/src/traces/scattergl/hover.js b/src/traces/scattergl/hover.js
index 04709c058ee..6e7c03a947c 100644
--- a/src/traces/scattergl/hover.js
+++ b/src/traces/scattergl/hover.js
@@ -109,7 +109,7 @@ function calcHover(pointData, x, y, trace) {
 
     var font = trace.textfont;
     if(font) {
-        di.ts = Array.isArray(font.size) ? font.size[id] : font.size;
+        di.ts = Lib.isArrayOrTypedArray(font.size) ? font.size[id] : font.size;
         di.tc = Array.isArray(font.color) ? font.color[id] : font.color;
         di.tf = Array.isArray(font.family) ? font.family[id] : font.family;
     }
@@ -118,7 +118,7 @@ function calcHover(pointData, x, y, trace) {
     if(marker) {
         di.ms = Lib.isArrayOrTypedArray(marker.size) ? marker.size[id] : marker.size;
         di.mo = Lib.isArrayOrTypedArray(marker.opacity) ? marker.opacity[id] : marker.opacity;
-        di.mx = Array.isArray(marker.symbol) ? marker.symbol[id] : marker.symbol;
+        di.mx = Lib.isArrayOrTypedArray(marker.symbol) ? marker.symbol[id] : marker.symbol;
         di.mc = Lib.isArrayOrTypedArray(marker.color) ? marker.color[id] : marker.color;
     }
 
@@ -143,10 +143,10 @@ function calcHover(pointData, x, y, trace) {
     if(hoverlabel) {
         di.hbg = Array.isArray(hoverlabel.bgcolor) ? hoverlabel.bgcolor[id] : hoverlabel.bgcolor;
         di.hbc = Array.isArray(hoverlabel.bordercolor) ? hoverlabel.bordercolor[id] : hoverlabel.bordercolor;
-        di.hts = Array.isArray(hoverlabel.font.size) ? hoverlabel.font.size[id] : hoverlabel.font.size;
+        di.hts = Lib.isArrayOrTypedArray(hoverlabel.font.size) ? hoverlabel.font.size[id] : hoverlabel.font.size;
         di.htc = Array.isArray(hoverlabel.font.color) ? hoverlabel.font.color[id] : hoverlabel.font.color;
         di.htf = Array.isArray(hoverlabel.font.family) ? hoverlabel.font.family[id] : hoverlabel.font.family;
-        di.hnl = Array.isArray(hoverlabel.namelength) ? hoverlabel.namelength[id] : hoverlabel.namelength;
+        di.hnl = Lib.isArrayOrTypedArray(hoverlabel.namelength) ? hoverlabel.namelength[id] : hoverlabel.namelength;
     }
     var hoverinfo = trace.hoverinfo;
     if(hoverinfo) {
diff --git a/src/traces/splom/defaults.js b/src/traces/splom/defaults.js
index a2302a581ce..4d062510d9d 100644
--- a/src/traces/splom/defaults.js
+++ b/src/traces/splom/defaults.js
@@ -15,7 +15,7 @@ var attributes = require('./attributes');
 var subTypes = require('../scatter/subtypes');
 var handleMarkerDefaults = require('../scatter/marker_defaults');
 var mergeLength = require('../parcoords/merge_length');
-var OPEN_RE = /-open/;
+var isOpenSymbol = require('../scattergl/helpers').isOpenSymbol;
 
 module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout) {
     function coerce(attr, dflt) {
@@ -44,7 +44,7 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
 
     handleMarkerDefaults(traceIn, traceOut, defaultColor, layout, coerce);
 
-    var isOpen = OPEN_RE.test(traceOut.marker.symbol);
+    var isOpen = isOpenSymbol(traceOut.marker.symbol);
     var isBubble = subTypes.isBubble(traceOut);
     coerce('marker.line.width', isOpen || isBubble ? 1 : 0);
 
diff --git a/test/image/baselines/gl2d_symbol_numbers.png b/test/image/baselines/gl2d_symbol_numbers.png
new file mode 100644
index 00000000000..cf0a00b987e
Binary files /dev/null and b/test/image/baselines/gl2d_symbol_numbers.png differ
diff --git a/test/image/baselines/splom_symbol_numbers.png b/test/image/baselines/splom_symbol_numbers.png
new file mode 100644
index 00000000000..9ce83751902
Binary files /dev/null and b/test/image/baselines/splom_symbol_numbers.png differ
diff --git a/test/image/mocks/gl2d_symbol_numbers.json b/test/image/mocks/gl2d_symbol_numbers.json
new file mode 100644
index 00000000000..e60155b8d08
--- /dev/null
+++ b/test/image/mocks/gl2d_symbol_numbers.json
@@ -0,0 +1,32 @@
+{
+    "data": [
+        {
+            "y": [
+                0,
+                0,
+                0
+            ],
+            "type": "scattergl",
+            "marker": {
+                "size": 24,
+                "symbol": "diamond-open-dot"
+            }
+        },
+        {
+            "y": [
+                1,
+                1,
+                1
+            ],
+            "type": "scattergl",
+            "marker": {
+                "size": 24,
+                "symbol": 302
+            }
+        }
+    ],
+    "layout": {
+        "width": 600,
+        "height": 400
+    }
+}
diff --git a/test/image/mocks/splom_symbol_numbers.json b/test/image/mocks/splom_symbol_numbers.json
new file mode 100644
index 00000000000..09f63059ec9
--- /dev/null
+++ b/test/image/mocks/splom_symbol_numbers.json
@@ -0,0 +1,41 @@
+{
+    "data": [
+        {
+            "type": "splom",
+            "marker": {
+                "size": [
+                    12,
+                    16,
+                    24,
+                    32
+                ],
+                "symbol": [
+                    1,
+                    102,
+                    203,
+                    304
+                ]
+            },
+            "dimensions": [
+                {
+                    "values": [
+                        0,
+                        1,
+                        2,
+                        3
+                    ],
+                    "label": "A"
+                },
+                {
+                    "values": [
+                        0,
+                        2,
+                        5,
+                        6
+                    ],
+                    "label": "B"
+                }
+            ]
+        }
+    ]
+}