Vyper Memory Layout
https://github.com/ethereum/vyper/blob/17a4f43992a39fa17e55943603853c5b1d64c60f/vyper/utils.py
code: system purpose
# Number of bytes in memory used for system purposes, not for variables
class MemoryPositions:
ADDRSIZE = 32
MAXNUM = 64
MINNUM = 96
MAXDECIMAL = 128
MINDECIMAL = 160
FREE_VAR_SPACE = 192
FREE_VAR_SPACE2 = 224
BLANK_SPACE = 256
FREE_LOOP_INDEX = 288
RESERVED_MEMORY = 320
#Vyper