TST/BUG Test full precision of scalars is obtained
TST/BUG Test full precision of scalars is obtained

Demonstrates that issue #411 was fixed with
79a65ca14e0b3b82d68d53a905709d338e0513f1
by adding a small test comparing some scalars captured and then
compared to the expected value. No absolute nor relative tolerance
is used with pytest for as strict as a test as possible

CORE-GATECH-GROUP/serpent-tools,CORE-GATECH-GROUP/serpent-tools