Optimize stroke width extraction.

lib/extract/extractStroke.js

@@ -32,7 +32,7 @@ export default function(props, styleProperties) {
         }
     }
 
-    const { stroke, strokeWidth, strokeDasharray } = props;
+    const { stroke, strokeWidth = 1, strokeDasharray } = props;
     const strokeDash =
         !strokeDasharray || strokeDasharray === "none"
             ? null
@@ -47,10 +47,7 @@ export default function(props, styleProperties) {
             strokeDash && strokeDash.length % 2 === 1
                 ? strokeDash.concat(strokeDash)
                 : strokeDash,
-        strokeWidth:
-            !strokeWidth || typeof strokeWidth !== "string"
-                ? String(strokeWidth || 1)
-                : strokeWidth,
+        strokeWidth,
         strokeDashoffset: strokeDasharray ? +props.strokeDashoffset || 0 : null,
         strokeMiterlimit: parseFloat(props.strokeMiterlimit) || 4,
     };

lib/extract/extractText.js

@@ -95,7 +95,7 @@ export function setTSpan(TSpanImplementation) {
 
 function getChild(child) {
     if (typeof child === "string" || typeof child === "number") {
-        return <TSpan>{child.toString()}</TSpan>;
+        return <TSpan>{String(child)}</TSpan>;
     } else {
         return child;
     }