[edsonsims]

Adds the opt-in strict_mode_for_literals requested in #170. With the option enabled, a loaded value must match both the value and exact type of a Literal argument: False no longer matches Literal[0], and an integer does not match an equal-valued IntEnum member. Mixed alternatives such as Literal[0, False] retain both choices. The default value-only matching remains unchanged.

The option works through JSONWizard.Meta/LoadMeta and EnvWizard.Meta/EnvMeta. It follows recursive Meta settings, while keeping sibling classes and their cached Literal/optional TypedDict loaders independent. Env loading uses the same value check; it does not add coercion of raw environment strings ('0' still does not match Literal[0]). Other field coercion, dumping and the legacy dataclass_wizard.v0 implementation are unchanged. Includes typed declarations, usage docs, README and changelog entries.

Validation:

• The 42 new cases produce 26 failures and 16 passing controls on the original source, then all pass on Python 3.10.16 and 3.13.1. They cover bool/int/float/enum distinctions, mixed alternatives, containers, optional/union values, inherited/recursive metadata, sibling declaration order and synthetic Env inputs.
• Canonical make test on Python 3.13.1: 926 passed, 2 skipped, 6 xfailed, 4 xpassed. All 896 existing case outcomes remain unchanged; 42 cases are added.
• Full-package mypy passes (47 source files); README rstcheck and AST checks pass. Sphinx HTML builds with the same 89 warnings as the original source.
• make lint remains nonzero on both trees: existing flake8 diagnostics decrease from 1,782 to 1,776. The Pylint command was also run separately because flake8 stops the target; it remains nonzero on both (4,038 to 4,036 diagnostics). Its existing statement-count warning changes from 198 to 200 for the metadata isolation/configuration statements. The new test file has no Ruff, flake8 or Pylint diagnostics.

The full tox matrix, PyPy, and Python 3.9/3.11/3.12/3.14 were not run locally.