# 🕵️ Table Enhancements Mystery - Investigation Log

## 📊 **Status**: DEFERRED (Strategic Decision)
- **Current Progress**: 29/34 tests (85%)
- **Test Status**: FAIL on assertion around line 81
- **Decision**: Focus on other 4 failing tests first

## 🔍 **Investigation Summary**

**Symptoms**: 
- Assertion failure: `..assert person.age = 30; /* Original unchanged */`
- Test fails around line 81 in `tests/unit/17_table_enhancements.txt`

**Verified Working Operations** ✅:
- **t.set immutability**: ✅ `person.age: 30` (unchanged after `t.set`)
- **t.delete immutability**: ✅ `person.age: 30` (unchanged after `t.delete`)
- **t.merge functionality**: ✅ Correct merging with precedence
- **t.length, t.has, t.get**: ✅ All return correct values
- **map, each combinators**: ✅ Proper immutability maintained
- **Individual assertions**: ✅ All pass when tested separately

**Ruled Out Hypotheses** ❌:
- ❌ **map mutation**: map function IS properly immutable
- ❌ **t.set mutation**: t.set IS properly immutable  
- ❌ **t.delete mutation**: t.delete IS properly immutable
- ❌ **Operation bugs**: All operations work correctly in isolation

**Remaining Mystery** 🤔:
- **Context dependency**: Something in the full test sequence causes failure
- **Variable reuse**: `person` variable used multiple times throughout test
- **Cumulative effect**: Unknown interaction between operations

## 🎯 **Strategic Decision**

**Action**: Deferred investigation in favor of:
1. Implementing missing table operations (`t.shape`, `t.append`, `t.prepend`)
2. Fixing other 4 failing tests for quicker wins
3. Returning to this mystery after achieving higher test coverage

**Rationale**: All core functionality works correctly, suggesting this is likely a test-specific issue rather than a fundamental implementation problem.