Limit float point values in extra headers to single precision

Author: chad-earthscope

ChangeLog

@@ -2,6 +2,7 @@
 	- Add ms_nstime2timestr_n() with string size limit, deprecate ms_nstime2timestr().
 	- With ms_nstime2timestr_n() print "ERROR" for NSTERROR and "UNSET" for NSTUNSET.
 	- Avoid fatal errors when v2 record blockettes contain invalid time stamps.
+	- Limit float point values in extra headers to single precision.
 	- Update yyjson to v0.12.0
 
 2025.227:

extraheaders.c

@@ -996,7 +996,7 @@ mseh_add_recenter_r (MS3Record *msr, const char *ptr, MSEHRecenter *recenter,
 int
 mseh_serialize (MS3Record *msr, LM_PARSED_JSON **parsestate)
 {
-  yyjson_write_flag flg = YYJSON_WRITE_NOFLAG;
+  yyjson_write_flag flg;
   yyjson_write_err err;
   yyjson_alc alc = {_priv_malloc, _priv_realloc, _priv_free, NULL};
 
@@ -1012,6 +1012,10 @@ mseh_serialize (MS3Record *msr, LM_PARSED_JSON **parsestate)
   if (!parsed || !parsed->mut_doc)
     return 0;
 
+  /* Limit float point values to single precision to avoid unrealistically
+   * high precision values in the output. */
+  flg = YYJSON_WRITE_FP_TO_FLOAT;
+
   /* Serialize new JSON string */
   serialized = yyjson_mut_write_opts (parsed->mut_doc, flg, &alc, &serialsize, &err);