fix --stake-amount parameter

freqtrade/commands/cli_options.py

@@ -133,7 +133,6 @@ AVAILABLE_CLI_OPTIONS = {
     "stake_amount": Arg(
         '--stake-amount',
         help='Override the value of the `stake_amount` configuration setting.',
-        type=float,
     ),
     # Backtesting
     "position_stacking": Arg(

freqtrade/configuration/configuration.py

@@ -229,6 +229,13 @@ class Configuration:
         elif config['runmode'] in NON_UTIL_MODES:
             logger.info('Using max_open_trades: %s ...', config.get('max_open_trades'))
 
+        if self.args.get('stake_amount', None):
+            # Convert explicitly to float to support CLI argument for both unlimited and value
+            try:
+                self.args['stake_amount'] = float(self.args['stake_amount'])
+            except ValueError:
+                pass
+
         self._args_to_config(config, argname='stake_amount',
                              logstring='Parameter --stake-amount detected, '
                              'overriding stake_amount to: {} ...')