High Performance PostgreSQL for Rails: Issue with bulk_load.sh

Hi and thank you for this fantastic book,

I ran in the following error while trying to run db/scripts/bulk_load.sh:

Bulk loading 10_000_000 Drivers and Riders
Raising the statement_timeout
ERROR:  syntax error at or near "_000_000"
LINE 19: FROM GENERATE_SERIES(1, 10_000_000) seq;

I manage to get the scrip running by removing the underscores from the 10 million e.g.:
FROM GENERATE_SERIES(1, 10000000) seq; instead of:
FROM GENERATE_SERIES(1, 10_000_000) seq;

Hope this helps,

Yann