blob breaking changes

cran

3 curated breaking changes across major versions of blob. Use this as a migration checklist before bumping dependencies.

changes

Breaking changes by transition

v1.1.1 \u2192 v1.2.0breaking
The `blob` class is now based on `list_of(raw())` from the vctrs package (#11). This adds support for `vec_cast()` and `vec_ptype2()`. Some operations (such as subset assignment) are now stricter. The `new_blob()` constructor permits safe and fast construction of `blob` objects from a list, and `validate_blob()` checks an existing object for conformity with the rules.
v1.1.1 \u2192 v1.2.0breaking
The new `is_blob()` deprecates the existing `is.blob()`. `as.blob()` is deprecated in favor of `vec_cast()` or the new `as_blob()` (which is just a thin wrapper around `vec_cast()`).
v1.1.1 \u2192 v1.2.0breaking
Indexing a vector of blobs out of bounds now raises an error. Use `NA` as index to create a `NULL` blob.

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