Get a kzp file from the release page and install it via the Koha plugin system.
cd lib; zip -r ../hks3_sru_https_proxy-0.900.kpz Koha/; cd ..
for plugin hook for "framework_defaults_override"
this plugin overrides already set values in the Marc Editor, useful eg when switching frameworks
'000' => { '@' => 1 },
'336' => { '2' => 1, 'a' => 1 , 'b' => 1 },
'337' => { '2' => 1, 'a' => 1 , 'b' => 1 },
'338' => { '2' => 1, 'a' => 1 , 'b' => 1 },
'500' => { 'a' => 1 },
'655' => { 'a' => 1 , 'b' => 1 },
'773' => { 'i' => 1 },
'942' => { 'c' => 1 },
see code. This mean eg Marc Field 336a will be changed on framework change