Added KWarg to calls to ujson, this aligns it FP presicion handing

with how python json manages imports.

Added log.

All DFs are now aligns, tests passes.

We cannot call import ujson as json as the kwarg breaks regular json.

freqtrade/optimize/__init__.py

@@ -11,13 +11,13 @@ from freqtrade import misc, constants, OperationalException
 from freqtrade.exchange import Exchange
 from freqtrade.arguments import TimeRange
 
+logger = logging.getLogger(__name__)
+
 import importlib
 ujson_found = importlib.util.find_spec("ujson")
 if ujson_found is not None:
     import ujson
-
-logger = logging.getLogger(__name__)
-
+    logger.debug('Loaded UltraJson ujson in optimize.py')
 
 def trim_tickerlist(tickerlist: List[Dict], timerange: TimeRange) -> List[Dict]:
     if not tickerlist:
@@ -68,12 +68,15 @@ def load_tickerdata_file(
     if os.path.isfile(gzipfile):
         logger.debug('Loading ticker data from file %s', gzipfile)
         with gzip.open(gzipfile) as tickerdata:
-            pairdata = json.load(tickerdata)
+            if ujson_found is not None:
+                pairdata = ujson.load(tickerdata, precise_float=True)
+            else:
+                pairdata = json.load(tickerdata)
     elif os.path.isfile(file):
         logger.debug('Loading ticker data from file %s', file)
         with open(file) as tickerdata:
             if ujson_found is not None:
-                pairdata = ujson.load(tickerdata)
+                pairdata = ujson.load(tickerdata, precise_float=True)
             else:
                 pairdata = json.load(tickerdata)
     else:
@@ -171,7 +174,10 @@ def load_cached_data_for_updating(filename: str,
     # read the cached file
     if os.path.isfile(filename):
         with open(filename, "rt") as file:
-            data = json.load(file)
+            if ujson_found is not None:
+                data = ujson.load(file, precise_float=True)
+            else:
+                data = json.load(file)
             # remove the last item, because we are not sure if it is correct
             # it could be fetched when the candle was incompleted
             if data: