fix(postgrest): use POST fallback for rpc get:true with object args

[AndroidPoet]

Description

rpc(fn, args, { get: true }) silently corrupts the request when any argument is an object (or an array containing objects): the object is stringified into the query string as the literal [object Object].

The rpc method already has a fallback that routes object-valued args to POST (objects can't be serialized into URL params), but the guard only checked head:

const _hasObjectArg = head && Object.values(args as object).some(_isObject)

Since head and get share the same URL-serialization branch (else if (head || get)), a get: true call with an object arg skipped the fallback and hit `${value}` → "[object Object]". The sibling head: true path handled it correctly.

Reproduction

supabase.rpc('fn', { filter: { a: 1 } }, { get: true })
// GET /rest/v1/rpc/fn?filter=%5Bobject+Object%5D   ❌

Fix

Extend the POST fallback to get as well, and keep return=minimal head-only so a get caller still receives the function result:

const _hasObjectArg = (head || get) && Object.values(args as object).some(_isObject)
// ...
if (head && _hasObjectArg) {
  headers.set('Prefer', count ? `count=${count},return=minimal` : 'return=minimal')
}

head && _hasObjectArg is equivalent to the original head-only condition, so the existing head behavior is unchanged. get: true with an object arg now sends POST with the args as the body and returns the function result.

Type of Change

• Bug fix (fix)

Testing

• Unit test added (test/fetch-errors.test.ts) asserting get: true + object args produces POST, the body carries the args, the URL contains no [object Object], and return=minimal is not set (so the body is returned).
• Verified the test fails on the pre-fix code (Received: "GET") and passes after the fix.
• All existing get: true tests (scalar / array / empty args) are unaffected — no test relied on the old behavior.

Checklist

• Code formatted (nx format:check passes)
• Builds passing (nx affected --target=build)
• Type tests passing (nx test:types postgrest-js)
• Common types in sync (codegen:check)
• Conventional commit

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commit: 2d886b2

[coveralls]

coverage: 92.942% (+12.6%) from 80.309% — AndroidPoet:fix/postgrest-rpc-get-object-args into supabase:master