[BUG] DO storage keys are case-sensitive on the edge, but Miniflare uses case-insensitive key matching with persistence #247

Example code (simplified version of what my script is doing), local disk persistence is turned on for DOs:

const key = "foo"
state.storage.put(key, { bar: 1})
const value = await state.storage.get(key.toUpperCase())

Behavior on the edge: value is undefined
Behavior in Miniflare: value is { bar: 1 }

Not sure this changes when persistence is turned off, don't assume so