All notable changes to this project will be documented in this file. The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

• Added System.DateOnly and System.TimeOnly polyfills for .NET Framework 4.8 / 4.8.1.
• Added System.Index and System.Range polyfills with full compiler-required members.
• Added unified slicing helpers under ModernBCL.Core.Slicing:
  • Array slicing (T[])
  • IList<T> slicing
  • String slicing (via char[])
• Added comprehensive SystemSample console examples:
  • DateOnly / TimeOnly usage
  • Index / Range semantics
  • Date, string, list slicing scenarios

• Refactored slicing helpers into a single namespace and file for clarity and discoverability.
• Clarified separation between System polyfills and ModernBCL helpers.
• Updated README to document new polyfills and slicing capabilities.

• Fixed compiler errors related to missing Index constructor and required members.
• Fixed DateOnly parity issues (DayNumber / arithmetic behavior).
• Resolved extension-method discoverability issues by unifying slicing namespaces.

• Multi-targeting support: net48, net481, and net8.0.
• Added HashAccumulator64 (64-bit hashing) with extremely low collision rates.
• Added full comparer suite:
  • ObjectHashComparer
  • EnumerableHashComparer
  • SequenceHashComparer
• Added complete Guard API with fluent syntax:
  • .Null()
  • .NullOrEmpty()
  • .NullOrWhiteSpace()
  • .OutOfRange()
  • Numeric validations
• Added fuzz test suites for:
  • HashAccumulator (32-bit)
  • HashAccumulator64
  • Guard validation system
• Added benchmark project targeting net8.0, powered by BenchmarkDotNet.

• Rebuilt HashCode polyfill using HashAccumulator for deterministic, order-sensitive hashing.
• Improved folder organization for clearer separation of polyfills, guards, hashing, comparers, tests, and benchmarks.
• Standardized testing to xUnit across the entire project.

• Resolved System.HashCode type conflict on .NET 8 by isolating polyfill with conditional compilation.
• Eliminated duplicate compile warnings by removing explicit rules.
• Ensured deterministic null-handling behavior in hashing APIs.

• Support both net48 and net481 target frameworks.

• Added Guard.ThrowIfNullOrEmpty and Guard.ThrowIfNullOrWhiteSpace.
• Introduced ValueTuple polyfills for .NET Framework.

• Updated XML comments and internal documentation.

• Resolved performance issue in HashCode.Combine under large input sets.

• Initial release of the ModernBCL.Core.HashCode polyfill.
• Added System.HashCode struct with dual-accumulator mixing.
• Implemented alternating rotation hashing (5-bit and 17-bit).
• Included non-commutative ToHashCode() algorithm.
• Added HashCode.Combine overloads for 1–8 parameters.

• Resolved swapped-input collisions in hashing implementation.