use `oneunit(T)` in `construct_seeds`

[longemen3000]

replaces #652 , fixes #651

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -3.13% :warning:

Comparison is base (2ff6808) 89.59% compared to head (a897f71) 86.46%.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-0.10     #659      +/-   ##
================================================
- Coverage         89.59%   86.46%   -3.13%     
================================================
  Files                11       10       -1     
  Lines               961      894      -67     
================================================
- Hits                861      773      -88     
- Misses              100      121      +21     

Files Changed	Coverage Δ
src/dual.jl	78.67% <100.00%> (-3.66%)	:arrow_down:
src/partials.jl	84.21% <100.00%> (-0.14%)	:arrow_down:

... and 8 files with indirect coverage changes

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[longemen3000]

The error in Julia latest seems unrelated?

[longemen3000]

bump?

[RomeoV]

Could use a rebase onto master. That makes the errors go away for me.