feat(vectordata): read manifests under the YAML 1.2 core schema

The engine's default JSON schema reads a tilde as the string it spells; the reference writes a naming tag in a profile_tags schema as a tilde, and reads under the core schema, where it is null.

nb-vectordata/src/main/java/io/nosqlbench/vectordata/internal/YamlData.java

@@ -18,18 +18,25 @@ package io.nosqlbench.vectordata.internal;
 import io.nosqlbench.vectordata.VectorDataException;
 import org.snakeyaml.engine.v2.api.Load;
 import org.snakeyaml.engine.v2.api.LoadSettings;
+import org.snakeyaml.engine.v2.schema.CoreSchema;
 
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-/** Checked conversion helpers for permissive YAML object trees. */
+/// Checked conversion helpers for permissive YAML object trees.
+///
+/// Documents are read under the YAML 1.2 **core** schema, the dialect
+/// the reference writes and reads: `~`, `null`, and `Null` are null —
+/// a naming tag in a `profile_tags` schema is declared as `~` — and
+/// `0x10` is an integer, while `yes` and `1_000` stay strings. The
+/// engine's default JSON schema would read `~` as the string it spells.
 public final class YamlData {
     private YamlData() { }
     public static Map<String, Object> map(Object value, String label) {
         if (!(value instanceof Map<?, ?> raw)) throw new VectorDataException(label + " must be a YAML mapping");
         Map<String, Object> result = new LinkedHashMap<>(); raw.forEach((key, item) -> result.put(String.valueOf(key), item)); return result;
     }
-    public static Object parseValue(String text, String label) { return new Load(LoadSettings.builder().setLabel(label).build()).loadFromString(text); }
+    public static Object parseValue(String text, String label) { return new Load(LoadSettings.builder().setLabel(label).setSchema(new CoreSchema()).build()).loadFromString(text); }
     public static Map<String, Object> parse(String text, String label) { return map(parseValue(text, label), label); }
     public static String string(Object value, String label) { if (value == null) throw new VectorDataException("Missing " + label); return String.valueOf(value); }
     public static String optionalString(Object value) { return value == null ? null : String.valueOf(value); }