# HG changeset patch
# User jbe
# Date 1452793391 -3600
# Node ID 33d43f5a319bb9b8b007c0caa51dc7df05f04a58
# Parent  387a303918a6b94ae880c87ce6f00038db289693
json.export(...): Avoid exponential representation for integral floats when they could fit into a 64 bit integer

diff -r 387a303918a6 -r 33d43f5a319b libraries/json/json.c
--- a/libraries/json/json.c	Thu Jan 14 18:01:33 2016 +0100
+++ b/libraries/json/json.c	Thu Jan 14 18:43:11 2016 +0100
@@ -1121,8 +1121,14 @@
       if (isinf(num)) return luaL_error(L, "JSON export not possible for infinite numbers");
       // check if float is integral:
       if (trunc(num) == num) {
-        // if yes, use maximum precision:
-        sprintf(numstr, "%.17g", num);  // NOTE: e.g. 12345678901234560
+        // avoid exponential notation for INT64's represented as float:
+        if (fabs(num) < 1e19) {
+          // use decimal notation:
+          sprintf(numstr, "%.0f", num);
+        } else {
+          // use maximum precision:
+          sprintf(numstr, "%.17g", num);  // NOTE: e.g. 12345678901234560
+        }
       } else {
         // determine necessary precision to represent double precision floating point number:
         sprintf(numstr, "%.15g", num);  // NOTE: e.g. 0.009 should not be 0.008999999999999999