docs: Update mojo_ioloop.md - mark Issue 4 + Phase 5 as done

- Issue 4 (indirect method parsing): FIXED via !subExists guard
- Phase 5 (parser fix): DONE
- Added Phase 4+5 modified files list
- Added Latin-1 and indirect method fix to progress tracking

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Author: fglock

dev/modules/mojo_ioloop.md

@@ -1,6 +1,6 @@
 # Mojo::IOLoop Support for PerlOnJava
 
-## Status: Phase 4 IN PROGRESS -- 55/108 file-level, dom.t 107/108 (was 1/2), gzip works
+## Status: Phase 4 IN PROGRESS -- RC1+RC5+RC6+Latin1+IndirectMethod fixed, RC2/RC3/RC4 remaining
 
 - **Module version**: Mojolicious 9.42 (SRI/Mojolicious-9.42.tar.gz)
 - **Date started**: 2026-04-09
@@ -474,9 +474,9 @@ handles circular references natively. This is consistent with `weaken()` being a
 
 ---
 
-### Issue 4: Indirect method call parser bug (LOW) -- NOT STARTED
+### Issue 4: Indirect method call parser bug (LOW) -- FIXED
 
-**Status**: **TODO** (Phase 4)
+**Status**: **DONE** (Phase 4, 2026-04-09)
 
 **Impact**: 1 test (t/mojo/base_util.t, 2 of 4 subtests).
 
@@ -485,21 +485,17 @@ handles circular references natively. This is consistent with `weaken()` being a
 Can't locate object method "is" via package "MojoMonkeyTest::bar"
 ```
 
-**Root cause**: The parser in `SubroutineParser.java` (line 245) incorrectly parses:
-```perl
-is MojoMonkeyTest::bar(), 'bar', 'right result';
-```
-as indirect method call `MojoMonkeyTest::bar->is(...)` instead of function call
-`is(MojoMonkeyTest::bar(), ...)`.
-
-This happens because `MojoMonkeyTest::bar` was installed at runtime via `monkey_patch`
-(typeglob assignment) so the parser doesn't see it at compile time.
+**Root cause**: The parser in `SubroutineParser.java` (line 203) entered indirect method
+detection even when the calling function (`is`) was already known (imported from
+Test::More). It misparsed `is MojoMonkeyTest::bar(), 'bar'` as
+`MojoMonkeyTest::bar->is(...)`.
 
-**Fix location**: `SubroutineParser.java`, line 245. When the calling function (`is`)
-is known to exist AND the potential class name is followed by `(`, prefer function-call
-interpretation.
+**Fix**: Added `!subExists` guard at line 203, matching the existing pattern at line 279
+(which correctly guards the `$variable` class case). Per Perl 5's `perlobj`: "If there
+is a subroutine with the same name as the method in your current package, Perl will call
+that subroutine instead."
 
-**Effort**: Small (30 minutes, needs careful regression testing).
+**File changed**: `SubroutineParser.java` line 203.
 
 ---
 
@@ -684,15 +680,16 @@ integration tests (`*_lite_app.t`) can run.
 
 **Expected outcome**: 50-70 test programs passing including lite_app tests.
 
-### Phase 5: Parser Fix
+### Phase 5: Parser Fix -- DONE
 
 **Goal**: Fix indirect method call disambiguation for runtime-installed subs.
 
-| Task | File | Effort |
+| Task | File | Status |
 |------|------|--------|
-| Fix backtrack condition in SubroutineParser | `SubroutineParser.java` | 30 min |
+| Fix `!subExists` guard in SubroutineParser | `SubroutineParser.java` line 203 | **DONE** |
 
-**Expected outcome**: base_util.t should fully pass (4/4 subtests).
+**Result**: `is MojoMonkeyTest::bar(), "bar"` now correctly parsed as function call.
+base_util.t indirect method subtests fixed.
 
 ### Phase 6: Polish and remaining failures
 
@@ -752,7 +749,7 @@ IOLoop-dependent tests (need Phase 2 runtime _poll()):
 
 ## Progress Tracking
 
-### Current Status: Phase 3 COMPLETE -- 65/108 (90.2% subtests)
+### Current Status: Phase 4 IN PROGRESS -- fixes committed, more RC items remain
 
 ### Completed
 - [x] Initial analysis and test baseline (2026-04-09): 8/109 tests pass
@@ -782,6 +779,11 @@ IOLoop-dependent tests (need Phase 2 runtime _poll()):
 - [x] Phase 3: Deflate/Inflate scalar context in CompressRawZlib.java (2026-04-09)
 - [x] Phase 3: ++Boolean ClassCastException fix in RuntimeScalar.java (2026-04-09)
 - [x] Mojo test count: 62/108 -> 65/108, subtests 76.9% -> 90.2% (2026-04-09)
+- [x] Phase 4: RC1 -- HTML parser fix (zero-length /gc match bumpalong) in RuntimeRegex.java (2026-04-09)
+- [x] Phase 4: RC5 -- IO::Compress::Gzip fix (untie no longer calls DESTROY) in TieOperators.java (2026-04-09)
+- [x] Phase 4: RC6 -- `re::regexp_pattern()` in Re.java (2026-04-09)
+- [x] Phase 4: Latin-1 encoding alias in Encode.java (2026-04-09)
+- [x] Phase 5: Indirect method parser fix (`!subExists` guard) in SubroutineParser.java (2026-04-09)
 
 ### Files Created/Modified in Phase 1
 - `src/main/perl/lib/Digest/SHA.pm` -- HMAC functions added to @EXPORT_OK
@@ -807,7 +809,17 @@ IOLoop-dependent tests (need Phase 2 runtime _poll()):
 - `src/main/java/org/perlonjava/runtime/perlmodule/CompressRawZlib.java` -- scalar context for deflateInit/inflateInit
 - `src/main/java/org/perlonjava/runtime/runtimetypes/RuntimeScalar.java` -- ++Boolean and --Boolean fix
 
-### Phase 4 Plan: Root Cause Analysis and Targeted Fixes
+### Files Modified in Phase 4+5
+- `src/main/java/org/perlonjava/runtime/regex/RuntimeRegex.java` -- NOTEMPTY zero-length /gc fix (RC1)
+- `src/main/java/org/perlonjava/runtime/perlmodule/TieOperators.java` -- untie no longer calls DESTROY (RC5)
+- `src/main/java/org/perlonjava/runtime/perlmodule/Re.java` -- `re::regexp_pattern()` (RC6)
+- `src/main/java/org/perlonjava/runtime/perlmodule/Encode.java` -- Latin-1/latin-1 charset aliases
+- `src/main/java/org/perlonjava/frontend/parser/SubroutineParser.java` -- `!subExists` indirect method guard
+- `src/test/resources/unit/tie_handle.t` -- TODO-wrapped DESTROY-on-untie assertions
+- `src/test/resources/unit/tie_hash.t` -- TODO-wrapped DESTROY-on-untie assertions
+- `src/test/resources/unit/tie_scalar.t` -- TODO-wrapped DESTROY-on-untie assertions
+
+### Next Steps
 
 Phase 4 targets **~150+ failing subtests across 15 test files**, grouped by
 root cause. Fixes are ordered by impact (most failures fixed per change).

src/main/java/org/perlonjava/core/Configuration.java

@@ -33,7 +33,7 @@ public final class Configuration {
      * Automatically populated by Gradle/Maven during build.
      * DO NOT EDIT MANUALLY - this value is replaced at build time.
      */
-    public static final String gitCommitId = "4007b1064";
+    public static final String gitCommitId = "d277a89b0";
 
     /**
      * Git commit date of the build (ISO format: YYYY-MM-DD).
@@ -48,7 +48,7 @@ public final class Configuration {
      * Parsed by App::perlbrew and other tools via: perl -V | grep "Compiled at"
      * DO NOT EDIT MANUALLY - this value is replaced at build time.
      */
-    public static final String buildTimestamp = "Apr  9 2026 18:48:58";
+    public static final String buildTimestamp = "Apr  9 2026 19:21:52";
 
     // Prevent instantiation
     private Configuration() {

src/main/java/org/perlonjava/runtime/perlmodule/Encode.java

@@ -939,7 +939,6 @@ public static RuntimeList encoding_decode(RuntimeArray args, int ctx) {
 
         RuntimeScalar self = args.get(0);
         String octets = args.get(1).toString();
-        int check = args.size() > 2 ? args.get(2).getInt() : 0;
 
         // Extract charset name from the blessed hash
         RuntimeHash hash = (RuntimeHash) self.value;