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-rw-r--r--src/lstrlib.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lstrlib.js b/src/lstrlib.js
index 2e623b6..13e325e 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -361,7 +361,7 @@ const str_format = function(L) {
} else {
let zero = s.indexOf(0);
lauxlib.luaL_argcheck(L, zero < 0 || zero === s.length - 1, arg, "string contains zeros");
- if (form.indexOf('.') < 0 && s.length >= 100) {
+ if (form.indexOf('.'.charCodeAt(0)) < 0 && s.length >= 100) {
/* no precision and string is too long to be formatted */
concat(b, s); /* keep entire string */
lapi.lua_pop(L, 1); /* remove result from 'luaL_tolstring' */