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zopu-code/repos/effect/.changeset/empty-env-values-missing.md

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effect
effect
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Treat empty strings as missing values in built-in ConfigProviders by default.

ConfigProvider.fromEnv, ConfigProvider.fromDotEnvContents, ConfigProvider.fromDotEnv, ConfigProvider.fromUnknown, and ConfigProvider.fromDir now treat literal empty strings as absent values when loaded as values, allowing Config.withDefault and Config.option to recover. Container discovery still reflects the source structure. Pass preserveEmptyStrings: true to restore the previous behavior.

ConfigProvider.fromDotEnv({ expandVariables: true }) now expands variables consistently with ConfigProvider.fromDotEnvContents.