integer ivars for boundary enforcement rather than ranges
@x_len rather than @xmax
80ch reformat
minimize bounds checking
avoid calls to #alive?
needed parentheses; more #between?
rename var for clarity
add simple benchmarks
rename var for clarity
add rake bench task
fix formatting
minitest ~> 5
need Benchmark in describe for Minitest 5
temporarily disable ruby warnings for tests
try requiring autorun first?
try using gemspec
accept BENCH_\*_THRESH env vars
ensure thresholds are floats
try using ENV vars; TICK expected to fail
one ENV str per environment
fix tick threshold to succeed