Collation / Fractional UCA / Implicit Weights Questions

[Kip Cole via CLDR-Users]

As part of my efforts to implement CLDR support for the Elixir language I’ve now started work on collations and working my way through TR10 and the relevant parts of TR35.  I have some questions on implicit weight calculation I’m unable to resolve and would appreciate any help or pointers on:

(1) Unified Ideograph vs Radical

Is there a preferred or intended strategy - to use the Unified Ideograph or radical definitions?

(2) Calculating implicit weights for radical definitions

TR10/TR35 seem quiet on the topic - my working assumption is to use the [fixed first implicit byte E0] and [fixed last implicit byte E4] in FractionalUCA.txt to generate implicit weights that respect the radical order (left to right, top to bottom).  Is that a reasonable working principle?

(3) Implicit weight calculations in general

TR10 at https://www.unicode.org/reports/tr10/#Implicit_Weights <https://www.unicode.org/reports/tr10/#Implicit_Weights> will generate weights with a top byte of 0xFB which would seem in conflict with the [fixed first implicit byte E0] and [fixed last implicit byte E4] indicators.  My working assumption is to use the algorithm in TR10 to calculate implicit weights except for radical definitions which would use the [fixed first] and [fixed last]

This would seem to align with TR35 which says:

"Note: The particular primary lead bytes for Hani vs. IMPLICIT vs. TRAILING are only an example” suggesting that Hani is calculated with leading bytes 0xFB per TR10 and the [fixed first implicit] can be used to generate weights for radicals (and other non specified code points)
Thanks in advance, —Kip 
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