fix(model): handle passing string projection to hydrate()

[vkarpov15]

Fix #16082

Summary

Quick fix for Model.hydrate(): use parseProjection() with no retainMinusPaths to handle string and array of string projections. Both docs and TypeScript types indicate Model.hydrate() supports string|string[] as projection argument, so runtime should support that too.

Examples

[Copilot]

Pull request overview

Fixes Model.hydrate() runtime handling for projection when passed as a string or string[], aligning behavior with the documented/typed API and preventing incorrect projection application.

Changes:

• Normalize hydrate()’s projection using parseProjection() before applying it.
• Expand hydrate() projection tests to cover object, string (exclusive), and string[] (inclusive) forms.
• Minor refactor in parseProjection() implementation (charAt() / slice()).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
lib/model.js	Parses projection in Model.hydrate() to correctly support string / string-array projections before applyProjection() and model creation.
test/model.hydrate.test.js	Adds coverage ensuring hydrate() respects object, string, and string[] projection inputs without marking docs modified.
lib/helpers/projection/parseProjection.js	Small internal implementation tweak used by hydrate() to convert string/array projections to an object form.