Unsuitable types for + operation (xs:string, xs:integer).

See #3188, release log:

• e90ca8b by @maxonfjvipon: fix(#3188): improved PhiMojo
• 0c0ed41 by @rultor: Merge branch '__rultor'
• 88b3b4b by @renovate[bot]: chore(deps): update dependency...
• 59de95d by @renovate[bot]: fix(deps): update dependency o...
• 9e5a08c by @rultor: Merge branch '__rultor'
• 70572a7 by @maxonfjvipon: Merge branch 'master' into fix...
• fe57bd3 by @rultor: Merge branch '__rultor'
• 70d9113 by @yegor256: Merge pull request #3179 from ...

Released by Rultor 2.0-SNAPSHOT, see build log