BinanceFeed doesn't normalize symbol case — fetchTicker/watchTicker silently hang then time out for non-canonical-case symbols #2415

Gap

BinanceFeed never normalizes symbol case when caching tickers or matching WebSocket subscriptions, unlike ChainlinkFeed, which upper-cases consistently at every entry point. Incoming ticker events always arrive with canonical uppercase symbols (e.g. "BTC/USDT"), so a caller who passes any other case (e.g. "btc/usdt") through either SDK's fetchTicker/watchTicker never gets a subscription match — the request silently hangs until a hardcoded timeout fires with a generic, misleading error.

Core

• core/src/feeds/binance/binance-feed.ts:102-104 (fetchTickerImpl): const cached = this.latestTickers.get(symbol); — raw symbol, not upper-cased.
• core/src/feeds/binance/binance-feed.ts:132-134 (watchTickerImpl): const sub: Subscription = { symbol, callback }; — raw symbol, not upper-cased.
• core/src/feeds/binance/binance-feed.ts:230-234 (handleMessage) dispatches with strict equality: if (sub.symbol === ticker.symbol) { sub.callback(ticker); }, and ticker.symbol always comes out canonical-uppercase via symbolToPair() (core/src/feeds/binance/normalizer.ts:11-22).
• Contrast core/src/feeds/chainlink/chainlink-feed.ts:128 (fetchTickerImpl): this.latestTickers.get(symbol.toUpperCase()), and :181 (watchTickerImpl): symbol: symbol.toUpperCase() — Chainlink correctly normalizes.

TypeScript SDK

sdks/typescript/pmxt/feed-client.ts:91-93 — fetchTicker(symbol) passes the caller's symbol straight through as a query param with no case normalization.

Python SDK

sdks/python/pmxt/feed_client.py:119-121 — fetch_ticker(symbol) — same, passes through verbatim.

Evidence

Read binance-feed.ts and chainlink-feed.ts side by side: Chainlink calls .toUpperCase() at both cache-lookup and subscription-registration sites; Binance does neither. core/test/unit/dataFeeds.core.test.ts only ever exercises canonical-case symbols like 'BTC/USDT', so this path is untested.

Impact

Calling feed.fetchTicker('btc/usdt') (or any non-canonical case) through either SDK against the binance feed never matches an incoming trade event, so the internal watchTickerImpl-based wait inside fetchTickerImpl (binance-feed.ts:107-118) silently hangs until the hardcoded 10s timeout and then throws "timed out waiting for trade" — with no indication the real cause is a case mismatch.

Found by automated Core-to-SDK surface coverage audit