- dtoa_impl::powers_of_ten() (10^0 to 10^19, one entry per line)
replaces powers_of_ten_16() and the table of int_pow10()
- put_literal() takes the length of a string literal from its type
- small_stack holds the heap vector by reference
- the growth step of the output buffer is written in hex
Signed-off-by: Niels Lohmann <mail@nlohmann.me>