GCC 7 warns when the first line of this function is inlined away into oblivion due to the caller relating depth and iterator depth, which is a desired

Returns -1 if end is reached before closing quote

document inline implementation

* GCC 8 fails to provide _mm512_set_epi8. We roll our own. */

computes h * 2^-shift

Helper to turn unprintable or newline characters into spaces

remove all final zeroes

! @brief appends a decimal representation of e to buf @return a pointer to the element following the exponent. @pre -1000 < e < 1000 */

! For n != 0, returns k, such that pow10 := 10^(k-1) <= n < 10^k. For n == 0, returns 1 and sets pow10 := 1. */