fix! set lsan options

.travis.yml

@@ -39,6 +39,7 @@ env:
     - ASAN_OPTIONS="detect_leaks=1:check_initialization_order=1:log_path=$LOG_DIR/asan"
     - TSAN_OPTIONS="log_path=$LOG_DIR/tsan"
     - UBSAN_OPTIONS="print_stacktrace=1 log_path=$LOG_DIR/ubsan"
+    - LSAN_OPTIONS="verbosity=1:log_threads=1"
     # Environment variables for Valgrind.
     - VALGRIND_LOG="$LOG_DIR/valgrind-%p.log"
     # Cache marker for third-party dependencies cache.

src/nvim/eval/encode.c

@@ -316,7 +316,7 @@ int encode_read_from_list(ListReaderState *const state, char *const buf,
 #define TYPVAL_ENCODE_CONV_FLOAT(tv, flt) \
     do { \
       const float_T flt_ = (flt); \
-      switch (fpclassify(flt_)) { \
+      switch (fpclassify((double)flt_)) { \
         case FP_NAN: { \
           ga_concat(gap, (char_u *) "str2float('nan')"); \
           break; \