[BUG] Zap incorrectly shadows variables which causes deserialization to fail

[nezuo]

Describe the bug

Zap de-serialization will shadow variables and try to use the value of the variable before it was shadowed

Reproduction

https://zap.redblox.dev/playground.html?code=ZXZlbnQgZXhhbXBsZSA9IHsNCiAgICBmcm9tOiBTZXJ2ZXIsDQogICAgdHlwZTogUmVsaWFibGUsDQogICAgY2FsbDogU2luZ2xlU3luYywNCiAgICBkYXRhOiBtYXAgeyBbdThdOiBtYXAgeyBbdThdOiBib29sZWFuIH0gfQ0KfQ0K

If you look at the client you will see:

local key
local val
key = buffer.readu8(incoming_buff, read(1))
val = {}
for _ = 1, buffer.readu16(incoming_buff, read(2)) do
    local key
    local val
    key = buffer.readu8(incoming_buff, read(1))
    val = buffer.readu8(incoming_buff, read(1)) == 1 -- shadows the `val` table
    val[key] = val -- errors because `val` is now a boolean instead of the table
end