added notes did more stuff

notes

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+const is a thing
+const convention is all upper with _
+const evaluation info: https://doc.rust-lang.org/reference/const_eval.html
+
+you can add arbitray scopes to modify local variables or for other purposes!
+	{
+	some random shit;
+	}
+
+https://doc.rust-lang.org/book/ch03-02-data-types.html
+
+scalars:
+	ints
+	floats
+	bools
+	chars
+integer types:
+	8-bit	i8	u8
+	16-bit	i16	u16
+	32-bit	i32	u32
+	64-bit	i64	u64
+	128-bit	i128	u128
+	arch	isize	usize
+
+number literals
+decimal	1_024
+hex	0xff
+oct	0o77
+binary	0b1100_1011_0100_0001
+byte	b'E'
+
+release builds have no overflow wrap checking
+don't rely on this behavior
+
+explicitly use
+`wrapping_*` methods to do this
+	such as wrapping_add
+Return the None value if there is overflow with the checked_* methods
+Return the value and a boolean indicating whether there was overflow with the overflowing_* methods
+
+wtf is this:
+  Saturate at the value’s minimum or maximum values with saturating_* methods
+
+there are f32 and f64 floats. f64 is default cause they are about the same speed
+
+normal math operators
+int division is floor
+remainder % exists
+
+all operators:
+https://doc.rust-lang.org/book/appendix-02-operators.html
+
+
+type annotation:
+
+let var: type = val;
+
+Rust’s char type is four bytes in size and represents a Unicode Scalar Value
+
+Compound types
+
+  primitive compound types:
+  	tuples
+	arrays
+
+Tuples:
+	fixed length combo of types
+	type is ()
+
+	pulling out the elements of a tuple into individual variables is called destructuring
+
+Arrays:
+	fixed type fixed length
+	[]
+
+	init:
+		let a: [1, 2, 3];
+		let a: [3, 0]; // set every element to same value
+	reference:
+		let first = a[0];
+	they are allocated on stack
+
+