⚡️ 0. Added a Slice.loadBool() function to the core library

It nicely mirrors the existing Builder.storeBool() function, loading a single bit as a signed Int and producing true if it's 1 in binary, and false otherwise.

let slice = beginCell().storeBool(true).asSlice();
let dice = slice.loadBool(); // true

💡 Inspired by a discussion with a community member
🧑‍🍳 Contributor: Gusarich
🐙 Implementation: #412
🍽 To be released in: v1.4.0


⚡️ 1. Fixed a compilation failure with as coins serialization in maps

Previously, if you've tried to compile the following (or similar):

import "@stdlib/deploy";

contract WhatCoin with Deployable {
    c: map<Address, Int as coins>; // ← 👀
}

It produced a compilation error, telling you that coins is unsupported in map values. But that wasn't right, coins serialization format for Ints as map keys and values should've been supported!

✅ And now it is, so the snippet above compiles just fine.

⁉️ Reported by: howardpen9
🧑‍🍳 Fixed by: Gusarich
🐙 Implementation: #413
🍽 To be released in: v1.4.0

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