Fix `find` routines' api to default to `last=-1` (#19761)

This changes the default for the `last` parameter of various `find`
routines from `0` to `-1`. Previous default prevents limiting the search
to the first character. This is a logic error, as full text search was
performed for 2 *valid* values of `last`: `0` and `last.high()`.

Adds an overload for `initSkipTable` which returns a newly initialized
table. This encapsulates every single usage of a `var`-acting original
func in this module.

Co-authored-by: flywind <xzsflywind@gmail.com>

0 files changed, 0 insertions, 0 deletions