zb: Add sync version of ProxyBuilder::build
This is useful if you want to build proxies inside a OnceCell::get_or_try_init closure. Proxy can also use this internally to explicitly avoid the recursion that never happens.
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This is useful if you want to build proxies inside a OnceCell::get_or_try_init closure. Proxy can also use this internally to explicitly avoid the recursion that never happens.