ToJSON: serialize boolean_columns to JSON boolean

Dependencies

• [2] 4OG3W43V Get rid of old ToJSON code path
• [*] LZVO64YG Merge in the first bits of the API work
• [*] SYLVCTT6 Start api cleanup with the User model

Change contents

• edit in src/lib/Hydra/Component/ToJSON.pm at line 8
  [4.2566]

  [4.2566]
  + use JSON;
• edit in src/lib/Hydra/Component/ToJSON.pm at line 21
  [5.217]

  [2.161]
  + foreach my $column (@{$hint->{boolean_columns}}) {

  + $json{$column} = $self->get_column($column) ? JSON::true : JSON::false;

  + }

  +