From 20adb486f7d6bee54e13913cbd658e18da79029d Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Thu, 13 Sep 2018 10:14:31 -0700
Subject: [core] Make "to-number" of null behave as documented

---
 src/mbgl/style/expression/coercion.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/mbgl')

diff --git a/src/mbgl/style/expression/coercion.cpp b/src/mbgl/style/expression/coercion.cpp
index 2481444dc4..187cdd48a4 100644
--- a/src/mbgl/style/expression/coercion.cpp
+++ b/src/mbgl/style/expression/coercion.cpp
@@ -10,6 +10,7 @@ namespace expression {
 
 EvaluationResult toNumber(const Value& v) {
     optional<double> result = v.match(
+        [](NullValue) -> optional<double> { return 0.0; },
         [](const double f) -> optional<double> { return f; },
         [](const std::string& s) -> optional<double> {
             try {
-- 
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