Use atsign-simd for sum
Fix hang/incorrect result for ndigits with b < 0.
Remove debug junk
Add tests for ndigits (issue #8266).
Move negative base check inside ndigits0z and add a test for (unsigned, signed) case.
ndigits: don't take abs(n) if b < 0.
Throw error when bigint ndigits has a negative base.
Merge remote-tracking branch 'julia/master' into ndigits_hang
Replace 'manual' cld with cld function now that #8111 has been merged.
Match previous ndigits0z interface.
reworked cluster manager interface
Call 0z version of ndigitsnb, which avoids an extra branch.
Complete the description of Pkg.init()

Provides guidance for those wishing to implement a custom METADATA setup
use double-double precision for sinpi
sind/cosd using double-double
translate trig kernel functions to julia
improve sinpi rationals, add tests for exact values
rename DoubleFloat types
check integer truncation (#5413) and make more operators follow T+T => T (#3759)

the sysimg builds, but still need to:
  - check same-size signed<->unsigned conversion
  - make tests pass
get numbers test passing with checked integer conversions and type-stable arithmetic