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This changes worker to use serde-wasm-bindgen package, rather than relying on the deprecated serde option in wasm-bindgen.
Description of the cyclic reference issue that I was hitting is here:
tkaitchuck/aHash#95
wasm_bindgen::JsValue::from_serde and wasm_bindgen::JsValue::into_serde are deprecated here (citing the cyclic reference issue that I encountered).
rustwasm/wasm-bindgen#3031
Also, additional description of serde-wasm-bindgen is found here (turns out that it was written by Cloudflare).
rustwasm/wasm-bindgen#1258
This patch replaces the usage of wasm_bindgen::JsValue::from_serde and wasm_bindgen::JsValue::into_serde with serde_wasm_bindgen::from_value() and serde_wasm_bindgen::to_value() equivalents.
Together with this patch in workers-kv here, the observed cyclic reference issues are gone.