Code review, minor suggestions/comment changes, questions. Looks great!

lib/src/main/java/dev/openfeature/javasdk/BaseEvaluation.java

@@ -1,7 +1,7 @@
 package dev.openfeature.javasdk;
 
 /**
- * We differ between the evaluation results that providers return and what is given to the end users. This is a common interface between them.
+ * This is the common interface between the evaluation results that providers return and what is given to the end users.
  * @param <T> The type of flag being evaluated.
  */
 public interface BaseEvaluation<T> {

lib/src/main/java/dev/openfeature/javasdk/EvaluationContext.java

@@ -1,6 +1,6 @@
 package dev.openfeature.javasdk;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectMapper; // jackson is pretty standard, I'm glad you decided on this for object support
 import lombok.*;
 
 import java.time.ZonedDateTime;
@@ -28,6 +28,8 @@ public class EvaluationContext {
     }
 
     // TODO Not sure if I should have sneakythrows or checked exceptions here..
+    // do you mean un-checked exceptions?
+    // I had no idea about SneakyThrows, but it seems like a nicer solution than swallowing in an unchecked exception. 
     @SneakyThrows
     public <T> void addStructureAttribute(String key, T value) {
         jsonAttributes.put(key, objMapper.writeValueAsString(value));

lib/src/main/java/dev/openfeature/javasdk/FeatureProvider.java

@@ -5,6 +5,7 @@ package dev.openfeature.javasdk;
  */
 public interface FeatureProvider {
     Metadata getMetadata();
+    // I think default methods are nicer than an abstract class, +1 to this.
     ProviderEvaluation<Boolean> getBooleanEvaluation(String key, Boolean defaultValue, EvaluationContext ctx, FlagEvaluationOptions options);
     ProviderEvaluation<String> getStringEvaluation(String key, String defaultValue, EvaluationContext ctx, FlagEvaluationOptions options);
     ProviderEvaluation<Integer> getIntegerEvaluation(String key, Integer defaultValue, EvaluationContext ctx, FlagEvaluationOptions options);

lib/src/main/java/dev/openfeature/javasdk/Features.java

@@ -1,7 +1,7 @@
 package dev.openfeature.javasdk;
 
 /**
- * An API for the type-specific fetch methods we offer end users.
+ * An API for the type-specific fetch methods offered to users.
  */
 public interface Features {
 

lib/src/main/java/dev/openfeature/javasdk/FlagEvaluationOptions.java

@@ -9,6 +9,8 @@ import java.util.List;
 
 @Data @Builder
 public class FlagEvaluationOptions {
+    // I guess because we are using boxed types, we can pass "Object" as T everywhere to avoid the
+    // "raw types" warning, but I'm not sure if that's really too helpful beyond removing some warnings
     @Singular private List<Hook> hooks;
     @Builder.Default
     private ImmutableMap<String, Object> hookHints = ImmutableMap.of();

lib/src/main/java/dev/openfeature/javasdk/OpenFeatureClient.java

@@ -84,6 +84,7 @@ public class OpenFeatureClient implements Client {
             }
             details.value = defaultValue;
             details.reason = Reason.ERROR;
+            // We may want to extend exception and add a defined code field, instead of just using message.
             details.errorCode = e.getMessage();
             this.errorHooks(hookCtx, e, mergedHooks, hints);
         } finally {
@@ -93,6 +94,7 @@ public class OpenFeatureClient implements Client {
         return details;
     }
 
+    // errorHooks and afterAllHooks error handling seems consistent with spec, and what I implemented. I'm glad we landed here.
     private void errorHooks(HookContext hookCtx, Exception e, List<Hook> hooks, ImmutableMap<String, Object> hints) {
         for (Hook hook : hooks) {
             try {
@@ -122,6 +124,7 @@ public class OpenFeatureClient implements Client {
     private EvaluationContext beforeHooks(HookContext hookCtx, List<Hook> hooks, ImmutableMap<String, Object> hints) {
         // These traverse backwards from normal.
         EvaluationContext ctx = hookCtx.getCtx();
+        // This is a bit counter-intuitive to me, just want to make sure... this is the stage that gets reversed because ArrayList.addAll() does a prepend, right?
         for (Hook hook : Lists.reverse(hooks)) {
             Optional<EvaluationContext> newCtx = hook.before(hookCtx, hints);
             if (newCtx != null && newCtx.isPresent()) {