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PHP 8.4 introduced a breaking change in `http_build_query()` that now serializes backed enums using their values and throws errors for non-backed enums, breaking previously stable code. The change was implemented without broader community discussion, causing unexpected runtime failures. A PHP URI toolkit library addresses this by introducing `QueryString::compose()` with multiple modes: `Compatible` (pre-8.4 behavior), `EnumCompatible` (strict enum handling), `EnumLenient` (silent ignoring), `Native` (mirrors PHP version), and `Safe` (predictable, type-safe alternative). The Safe mode represents a cleaner approach inspired by proposed RFC improvements to ext/uri, handling only specific scalar types and backed enums while properly representing null values and array lists.

Dealing with a PHP BC break

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