When entries in the context are substrings of one another, wrong match for URIs

[ssssarah]

Describe the bug

I am unsure how to describe this in general terms but take the example of the following resource:
https://bbp.epfl.ch/nexus/web/bbp/ionchannel/resources/https:%2F%2Fbbp.epfl.ch%2Fneurosciencegraph%2Fdata%2F000119dd-37fd-45ae-add9-9e5ac85a81a7

The last edit I made to it was on distribution.contentUrl.

• However, Fusion adds into its diff that some stimulus types were changed, but they weren't.
  The URI of the stimulus type has an entry in the context, but there is an entry before it in the context that is a substring of it:
  Fusion believes that "http://bbp.epfl.ch/neurosciencegraph/ontologies/stimulustypes/Activation" is A:ctivation because it matches with the "http://bbp.epfl.ch/neurosciencegraph/ontologies/stimulustypes/A" entry in the context.

• Additionally if one tries to traverse the link it generates an error:
  Resource 'A%3Activation' not found

• Finally, this is also happening when fetching this resource without the original payload.
  GET https://bbp.epfl.ch/nexus/v1/resources/bbp/ionchannel/_/https:%2F%2Fbbp.epfl.ch%2Fneurosciencegraph%2Fdata%2F000119dd-37fd-45ae-add9-9e5ac85a81a7

What part of Nexus is affected

• Fusion
• Delta