use arity to solve surprising toggle behavior for picocli boolean

Signed-off-by: garyschulte <garyschulte@gmail.com>

Author: garyschulte

besu/src/main/java/org/hyperledger/besu/cli/options/unstable/SynchronizerOptions.java

@@ -291,6 +291,7 @@ public void parseBlockPropagationRange(final String arg) {
       names = SNAP_SERVER_ENABLED_FLAG,
       hidden = true,
       paramLabel = "<Boolean>",
+      arity = "0..1",
       description = "Snap sync server enabled (default: ${DEFAULT-VALUE})")
   private Boolean snapsyncServerEnabled = SnapSyncConfiguration.DEFAULT_SNAP_SERVER_ENABLED;
 
@@ -362,6 +363,7 @@ public static SynchronizerOptions fromConfig(final SynchronizerConfiguration con
     options.snapsyncFlatStorageHealedCountPerRequest =
         config.getSnapSyncConfiguration().getLocalFlatStorageCountToHealPerRequest();
     options.checkpointPostMergeSyncEnabled = config.isCheckpointPostMergeEnabled();
+    options.snapsyncServerEnabled = config.getSnapSyncConfiguration().isSnapServerEnabled();
     return options;
   }
 

besu/src/test/java/org/hyperledger/besu/cli/options/SynchronizerOptionsTest.java

@@ -78,6 +78,7 @@ protected SynchronizerConfiguration.Builder createCustomizedDomainObject() {
                 .storageCountPerRequest(SnapSyncConfiguration.DEFAULT_STORAGE_COUNT_PER_REQUEST + 2)
                 .bytecodeCountPerRequest(
                     SnapSyncConfiguration.DEFAULT_BYTECODE_COUNT_PER_REQUEST + 2)
+                .isSnapServerEnabled(Boolean.TRUE)
                 .build());
   }
 

besu/src/test/resources/everything_config.toml

@@ -217,6 +217,7 @@ receipt-compaction-enabled=true
 # feature flags
 Xsecp256k1-native-enabled=false
 Xaltbn128-native-enabled=false
+Xsnapsync-server-enabled=true
 
 # compatibility flags
 compatibility-eth64-forkid-enabled=false