fix: fallthrough bug in transformDoubleReply

[rhymincymon]

The inner switch in transformDoubleReply is missing break statements, causing every case to fall through to default and overwrite ret with Number(reply). This means '+inf' and '-inf' replies are never correctly converted to Infinity and -Infinity.

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Note

Medium Risk
Touches shared reply-parsing logic used across many commands; while the change is small, it alters how special double strings are converted and could affect downstream consumers that relied on the previous (buggy) behavior.

Overview
Fixes transformDoubleReply so RESP2 double string replies for +inf/-inf/nan no longer fall through to the default numeric conversion.

Adds missing break statements in the inner switch, ensuring Infinity, -Infinity, and NaN are preserved instead of being overwritten by Number(reply).

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